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Dennis Ritchie
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Dennis Ritchie

American computer scientist, co-inventor of the Unix operating system and the C programming language

Dennis MacAlistair Ritchie was an American computer scientist. He created, together with long-time colleague Ken Thompson, the Unix operating system, C programming language, and B programming language. Ritchie and Thompson were awarded the Turing Award from the Association for Computing Machinery (ACM) in 1983, the IEEE Richard W. Hamming Medal from the Institute of Electrical and Electronics Engineers (IEEE) in 1990, and the National Medal of Technology from President Bill Clinton in 1999.

Dennis Ritchie was born on Tuesday, 09. September 1941.
That was day 252 of the year 1941.

Past away on Wednesday October 12, 2011

Age when dead:
70 Jahre 1 Monate 3 Tage

Next birthday would be:
Sunday September 9, 2012

Dennis Ritchie is already dead since:
14 Jahre 3 Monate 9 Tage

Dennis Ritchie was alive for 25600 days.
Dennis Ritchie is already dead for 5215 days.
Difference: 20385 days (55,81 years).

Dennis Ritchie has the same birthday like
Cardinal Richelieu, Colonel Sanders and Michelle Williams

The death date of Dennis Ritchie is the birthday of
Luciano Pavarotti

Birthday Fun Facts

Things that matter

  • The day 09 of month September 1941 was the 9th day of Autumn (meteorological). The day 09 of month September 1941 was the 81st day of Summer (astronomical).
  • Age 70 The number 70 represents the element Ytterbium in the Periodic table of elements.
    Ytterbium is a lanthanide, used in electronics, magnets, and advanced materials.
  • Since you visited this page, people have been born. In total there are people born today. They all celebrate the same birthday as you.

Who has the same birthday as Dennis Ritchie?

Famous people and celebrities

Cardinal Richelieu 57

Cardinal Richelieu

French clergyman, cardinal, noble and statesman (1585-1642)

Born: September 9, 1585

Died: December 4, 1642

Would be 441 years
Cesare Pavese 41

Cesare Pavese

Italian writer, literary critic, and translator (1908–1950)

Born: September 9, 1908

Died: August 27, 1950

Would be 118 years
Hugh Grant 65

Hugh Grant

British actor

Born: September 9, 1960

🎂 Turns 66 years

Same vintage - 1941

These people were born in the same year

Bernardo Bertolucci 77

Bernardo Bertolucci

Italian film director and screenwriter (1941–2018)

Born: March 16, 1941

Died: November 22, 2018

Would be 85 years
Richard Dawkins 84

Richard Dawkins

English ethologist, evolutionary biologist and author (born 1941)

Born: March 26, 1941

🎂 Turns 85 years
Sergio Mattarella 84

Sergio Mattarella

President of Italy

Born: July 23, 1941

🎂 Turns 85 years

Did you know? Dennis Ritchie is ...

Generation Traditionals

Period: 1922 ‐ 1955

At 70 years, Dennis Ritchie belongs to the "Generation of Traditionals". Well-known figures of this generation include Mary Steenburgen, Ned Romero und Jan Davis.

The "Traditionals" (also known as the “Traditionalists” or the “Silent Generation”) are people born roughly between 1922 and 1955. They grew up during economic hardship, war, and a culture that emphasized discipline. This generation values loyalty, responsibility, and stability. They are known for a strong work ethic and a preference for clear hierarchies and respect for authority.

Astrology

Zodiac

♍ Virgo

(August 24, 1941 - September 23, 1941)

Zodiac sign

Snake

(August 24, 1941 - September 23, 1941)

Life Number

6

(Perfectionist, creative, ambitious)

Birthstone

Sapphire

(Wisdom, loyalty, nobility)

Age in absolute numbers

Since Dennis Ritchie was born...

2.211.840.000 Seconds
36.864.000 Minutes
614.400 Hours
25.600 Days
3.657 Weeks
1012 Months
70 Years
7.01 Decades
0.7 Centuries

On July 25, 2026 would be Dennis Ritchie exactly 31000 days old.
On July 7, 2037 would be Dennis Ritchie exactly 5000 weeks old.

By the way: Since you are here you are getting seconds older 😉

Milestones

Successes that speak for themselves

With 70 years alive you reached these milestones:

Sleeping

8.533 days

A human spends about one third of their life sleeping. That’s an average of around 8.533 hours per day. At your age of 70 years, that equals approximately 8.533 days (23,36 years).

Eat & Drink

1.067 days

The average person spends about 1 hour a day eating and drinking. At 70 years, you have therefore spent approximately 1.067 days eating. (2,92 years).

Toilet visits

533 days

The average person spends about 30 minutes on the toilet every day. That's a total of 533 days (1,46 years).

Wait

889 days

The average person spends about 30 minutes on the toilet every day. That's a total of 889 days (2,43 years).

Laugh

107 days

We laugh for about six minutes a day. That's actually far too less. That's a total of 107 days (0,29 years).

Brush teeth

71 days

We laugh for about six minutes a day. That's actually far too less. That's a total of 71 days (0,19 years).

Work

6.933 days

We laugh for about six minutes a day. That's actually far too less. That's a total of 6.933 days (18,98 years).




Name Zahl Beschreibung
Breaths 663.552.000 Approximately 18 Breaths per minute
Heartbeats 2.764.800.000 Approximately 50-100 heartbeats per minute, depending on your lifestyle. We'll take the average at 75.
Blink 552.960.000 A human blinks roughly 15 times per minute.
Cough 384.000 A human has an average of 15 coughs per day.
Colds 140 A person gets about 2 colds per year.
Sweat produced 3.840 A person produces approximately 0.5–1.5 liters of sweat per day, depending on lifestyle. We'll take the average at 1 liter per day.
Fart gases produced (in Liters) 25.600 A person farts approximately 12 times a day, producing almost 0.8 liters of gas.
Flies swatted 491 We swat 7 flies per year.
Mosquitoes killed 1.262 We kill approximately 18 mosquitoes per year.
Red blood cells formed 512.000.000.000.000 A person produces approximately 20 billion red blood cells per day.
Hair grown (in mm) 8.448 Our hair grows approximately 0.33mm per day.
Fingernails grown (in mm) 2.926 Fingernails grow approximately 0.8mm per week.
Cookies eaten 30.464 We eat approximately 35,000 cookies in our lifetime.
Bouts of vomiting 280 A person vomits approximately four times a year, depending on lifestyle.

Information is based on statistical average values of a person.

Travelled distances

Always on the move

According to statistical averages, you have walked 92.160 kilometers in your life...


... that corresponds to 2,30 orbits of the Earth...


... 8,44 moon orbits.


... and 4,32 Mars orbit on foot.



92.160 kilometers means:

3.504 years with a snail 🐌 (at 3m/h).
686 days on a donkey 🫏 (at 5,6km/h).
480 days on a Skateboard 🛹 (at 8km/h).
128 days travel with a subway train 🚇 (at 30km/h).
5 days on a plane ✈️ (at 800km/h)
3,29 hours on a Spaceshuttle 🚀 (at 28.000km/h)
90,89 minutes with spaceship Voyager 1 🚀 (at 60840km/h)
8,01 minutes with Parker Space Probe - the fastest object made by humans 🚀 (at 690000km/h)

and

3,11 days sonic speed (at 1234,8 km/h)
0,31 seconds light speed (at 1,08 Mrd km/h)

Astronomy

Our Solar System

During the lifetime of Dennis Ritchie ...

... the Moon has orbited Earth 937 times.
... Mercury has orbited Sun 291,01 times.
... Venus has orbited Sun 113,93 times.
... Earth has orbited Sun 70,09 times.
... Mars has orbited Sun 37,26 times.
... Jupiter has orbited Sun 5,91 times.
... Saturn has orbited Sun 2,38 times.
... Uranus has orbited Sun 0,83 times.
... Neptune has orbited Sun 0,43 times.
... Pluto has orbited Sun 0,28 times.

Special birthdays

Next major birthday for Dennis Ritchie would be: Tuesday, 09.09.2031 (90 years)

Birthday Year Weekday Date Candles blown
10. 1951 Sunday September 9, 1951 55
18. 1959 Wednesday September 9, 1959 171
20. 1961 Saturday September 9, 1961 210
25. 1966 Friday September 9, 1966 325
30. 1971 Thursday September 9, 1971 465
40. 1981 Wednesday September 9, 1981 820
50. 1991 Monday September 9, 1991 1275
60. 2001 Sunday September 9, 2001 1830
70. 2011 Friday September 9, 2011 2485
80. 2021 Thursday September 9, 2021 3240
90. 2031 Tuesday September 9, 2031 4095
100. 2041 Monday September 9, 2041 5050
110. 2051 Saturday September 9, 2051 6105
120. 2061 Friday September 9, 2061 7260
130. 2071 Wednesday September 9, 2071 8515
140. 2081 Tuesday September 9, 2081 9870
150. 2091 Sunday September 9, 2091 11325
---

Birthday in numbers

Other Number systems

Decimal:
9 • 9 • 1941
Binary:
1001 • 1001 • 11110010101
Hexadecimal:
9 • 9 • 795
Octal:
11 • 11 • 3625
Roman:
IX • IX • MCMXLI
Morsecode:
−−−−− −−−−· ·−·−·− −−−−− −−−−· ·−·−·− ·−−−− −−−−· ····− ·−−−−
Numbers to letters:
aj • aj • bjeb
Cross sum:
33
Factor product:
157221
Birthday in words:
nine • nine • one thousand nine hundred forty one

Historical Events

How old was Dennis Ritchie back then?

Als Baby (0-2 Jahre)

December 7, 1941
Japan attacks the U.S. naval base at Pearl Harbor, prompting the United States to formally enter World War II. (Age: 0 years and 2 months) 🔗
June 4, 1942
The Battle of Midway, a decisive naval victory for the U.S. against Japan, marks a turning point in the Pacific War. (Age: 0 years and 8 months) 🔗
August 23, 1942
The Battle of Stalingrad begins, one of the largest and bloodiest battles in the history of warfare. (Age: 0 years and 11 months) 🔗
September 8, 1943
Italy surrenders to the Allies, though fighting continues as German forces occupy northern Italy. (Age: 1 years and 11 months) 🔗

Als Kind (2-10 Jahre)

June 6, 1944
D-Day: Allied forces launch Operation Overlord, landing on the beaches of Normandy, beginning the liberation of Western Europe. (Age: 2 years and 8 months) 🔗
April 30, 1945
Adolf Hitler commits suicide in his Berlin bunker as Soviet troops close in. (Age: 3 years and 7 months) 🔗
May 8, 1945
V-E Day (Victory in Europe Day): The Allies formally accept the unconditional surrender of Nazi Germany. (Age: 3 years and 7 months) 🔗
August 6, 1945
The U.S. drops an atomic bomb on Hiroshima, Japan, followed by a second bomb on Nagasaki three days later. (Age: 3 years and 10 months) 🔗
September 2, 1945
V-J Day (Victory over Japan Day): Japan formally surrenders, officially ending World War II. (Age: 3 years and 11 months) 🔗
October 24, 1945
The United Nations (UN) is officially established as an international organization aimed at promoting global cooperation. (Age: 4 years and 1 months) 🔗
November 20, 1945
The Nuremberg trials, a series of military tribunals, begin for major war criminals of Nazi Germany. (Age: 4 years and 2 months) 🔗
March 5, 1946
Winston Churchill delivers his "Iron Curtain" speech in the U.S., warning of Soviet expansion and popularizing the term Cold War. (Age: 4 years and 5 months) 🔗
June 5, 1947
U.S. Secretary of State George Marshall announces the Marshall Plan, an initiative to aid Western Europe in economic recovery after WWII. (Age: 5 years and 8 months) 🔗
August 15, 1947
India gains independence from British rule, leading to the partition of British India into India and Pakistan. (Age: 5 years and 11 months) 🔗

Als Jugendlicher 10-20 Jahre

February 6, 1952
Elizabeth II ascends to the throne upon the death of her father, King George VI. (Age: 10 years and 4 months) 🔗
April 25, 1953
James Watson and Francis Crick publish their paper describing the double helix structure of DNA, a monumental discovery in biology. (Age: 11 years and 7 months) 🔗
June 17, 1953
The Uprising of 1953 in East Germany occurs, where protests against economic policy are suppressed by Soviet troops. (Age: 11 years and 9 months) 🔗
June 18, 1953
Egypt is declared a republic, ending the Muhammad Ali dynasty. (Age: 11 years and 9 months) 🔗
May 17, 1954
The U.S. Supreme Court rules in Brown v. Board of Education, declaring state-sponsored segregation in public schools unconstitutional. (Age: 12 years and 8 months) 🔗
July 20, 1954
The Geneva Accords are signed, dividing Vietnam into North and South along the 17th parallel. (Age: 12 years and 10 months) 🔗
April 18, 1955
Albert Einstein, the German-born theoretical physicist and creator of the theory of relativity, dies at age 76. (Age: 13 years and 7 months) 🔗
May 14, 1955
The Warsaw Pact, a mutual defense treaty, is established by the Soviet Union and Eastern Bloc countries as a counterbalance to NATO. (Age: 13 years and 8 months) 🔗
December 1, 1955
Rosa Parks refuses to give up her bus seat to a white man in Montgomery, Alabama, sparking the Montgomery Bus Boycott. (Age: 14 years and 2 months) 🔗
October 23, 1956
The Hungarian Revolution begins, a nationwide revolt against the government of the Hungarian People's Republic and Soviet-imposed policies. (Age: 15 years and 1 months) 🔗

Als Erwachsener 20-30 Jahre

October 16, 1962
The Cuban Missile Crisis begins, bringing the United States and the Soviet Union to the brink of nuclear war. (Age: 21 years and 1 months) 🔗
August 28, 1963
Martin Luther King Jr. delivers his "I Have a Dream" speech during the March on Washington for Jobs and Freedom. (Age: 21 years and 11 months) 🔗
November 22, 1963
U.S. President John F. Kennedy is assassinated in Dallas, Texas. (Age: 22 years and 2 months) 🔗
July 2, 1964
The Civil Rights Act of 1964 is signed into law, outlawing discrimination based on race, color, religion, sex, or national origin. (Age: 22 years and 9 months) 🔗
October 14, 1964
Martin Luther King Jr. is awarded the Nobel Peace Prize. (Age: 23 years and 1 months) 🔗
March 7, 1965
The "Bloody Sunday" confrontation occurs during the Selma to Montgomery marches, highlighting the need for voting rights legislation. (Age: 23 years and 5 months) 🔗
August 6, 1965
The Voting Rights Act of 1965 is signed, overcoming legal barriers that prevented African Americans from exercising their right to vote. (Age: 23 years and 10 months) 🔗
December 13, 1966
The convention for the International Covenant on Economic, Social and Cultural Rights is adopted by the UN, a key international human rights treaty. (Age: 25 years and 3 months) 🔗
June 5, 1967
The Six-Day War begins, a short but decisive conflict between Israel and neighboring Arab states. (Age: 25 years and 8 months) 🔗
December 3, 1967
Christiaan Barnard performs the world's first successful human-to-human heart transplant in Cape Town, South Africa. (Age: 26 years and 2 months) 🔗

Als Erwachsener 30-40 Jahre

June 17, 1972
Five men are arrested for breaking into the Democratic National Committee headquarters at the Watergate complex, triggering the scandal. (Age: 30 years and 9 months) 🔗
September 5, 1972
The Munich Massacre occurs at the Summer Olympics, where members of the Israeli Olympic team are taken hostage and killed by Palestinian terrorists. (Age: 30 years and 11 months) 🔗
January 27, 1973
The Paris Peace Accords are signed, formally ending U.S. involvement in the Vietnam War. (Age: 31 years and 4 months) 🔗
October 6, 1973
The Yom Kippur War begins as Egypt and Syria launch a surprise attack on Israel. (Age: 32 years and 0 months) 🔗
October 17, 1973
OPEC places an oil embargo on nations supporting Israel, triggering the 1973 oil crisis and major economic disruption. (Age: 32 years and 1 months) 🔗
August 9, 1974
Richard Nixon resigns as U.S. President following the Watergate scandal, the only U.S. President ever to do so. (Age: 32 years and 11 months) 🔗
April 30, 1975
The Fall of Saigon marks the end of the Vietnam War, with North Vietnamese forces capturing the South Vietnamese capital. (Age: 33 years and 7 months) 🔗
June 25, 1975
Mozambique and Angola gain independence from Portugal, following years of armed liberation struggle. (Age: 33 years and 9 months) 🔗
April 1, 1976
Apple Computer is founded by Steve Jobs, Steve Wozniak, and Ronald Wayne. (Age: 34 years and 6 months) 🔗
May 25, 1977
The film "Star Wars: Episode IV – A New Hope" is released, launching one of the most successful film franchises of all time. (Age: 35 years and 8 months) 🔗

Als Erwachsener 40-50 Jahre

April 2, 1982
Argentina invades the Falkland Islands, starting the Falklands War with the United Kingdom. (Age: 40 years and 6 months) 🔗
January 1, 1983
The ARPANET officially switches to the TCP/IP protocol, considered the "birth" of the modern Internet. (Age: 41 years and 3 months) 🔗
January 24, 1984
Apple Computer launches the Macintosh, the first commercially successful personal computer with a graphical user interface (GUI). (Age: 42 years and 4 months) 🔗
December 2, 1984
A gas leak at the Union Carbide pesticide plant in Bhopal, India, kills thousands and is considered the world's worst industrial disaster. (Age: 43 years and 2 months) 🔗
March 11, 1985
Mikhail Gorbachev becomes General Secretary of the Communist Party of the Soviet Union, initiating policies of Glasnost and Perestroika. (Age: 43 years and 6 months) 🔗
July 13, 1985
The Live Aid dual-venue benefit concert is held to raise funds for famine relief in Ethiopia. (Age: 43 years and 10 months) 🔗
September 1, 1985
The wreck of the RMS Titanic is discovered by a joint US-French expedition led by Robert Ballard. (Age: 43 years and 11 months) 🔗
January 28, 1986
The Space Shuttle Challenger breaks apart 73 seconds into its flight, killing all seven crew members. (Age: 44 years and 4 months) 🔗
April 26, 1986
A catastrophic nuclear accident occurs at the Chernobyl Nuclear Power Plant in Soviet Ukraine, the worst nuclear disaster in history. (Age: 44 years and 7 months) 🔗
October 19, 1987
"Black Monday" sees stock markets around the world crash, with the Dow Jones Industrial Average dropping by 22.6% in a single day. (Age: 46 years and 1 months) 🔗

Als Erwachsener 50-60 Jahre

December 26, 1991
The Soviet Union is officially dissolved, ending the Cold War. (Age: 50 years and 3 months) 🔗
April 6, 1992
The Bosnian War, an international armed conflict, begins in Bosnia and Herzegovina. (Age: 50 years and 6 months) 🔗
September 13, 1993
The Oslo I Accord, the first direct agreement between Israel and the Palestine Liberation Organization (PLO), is signed. (Age: 52 years and 0 months) 🔗
April 7, 1994
The Rwandan genocide, a mass slaughter of Tutsi people by Hutu majority members, begins. (Age: 52 years and 6 months) 🔗
April 27, 1994
South Africa holds its first multiracial general election, marking the end of Apartheid. Nelson Mandela is elected President. (Age: 52 years and 7 months) 🔗
May 6, 1994
The Channel Tunnel, linking the United Kingdom and France, is officially opened. (Age: 52 years and 7 months) 🔗
April 19, 1995
A domestic terrorist truck bombing of the Alfred P. Murrah Federal Building in Oklahoma City. (Age: 53 years and 7 months) 🔗
August 9, 1995
Netscape Communications holds its initial public offering (IPO), marking the start of the dot-com boom. (Age: 53 years and 11 months) 🔗
August 24, 1995
Microsoft releases Windows 95, a major step in personal computing with its new graphical user interface. (Age: 53 years and 11 months) 🔗
July 5, 1996
Dolly the sheep, the first mammal to be cloned from an adult somatic cell, is born. (Age: 54 years and 9 months) 🔗

Als Erwachsener 60-70 Jahre

September 11, 2001
The September 11 attacks occur, where al-Qaeda terrorists hijack four planes, striking the World Trade Center and the Pentagon. (Age: 60 years and 0 months) 🔗
October 7, 2001
The U.S. and NATO allies invade Afghanistan following the September 11 attacks to dismantle al-Qaeda and remove the Taliban. (Age: 60 years and 0 months) 🔗
December 11, 2001
The People's Republic of China officially joins the World Trade Organization (WTO), integrating its economy deeply into global trade. (Age: 60 years and 3 months) 🔗
January 1, 2002
Euro banknotes and coins are introduced in 12 Eurozone member states, completing the currency's transition. (Age: 60 years and 3 months) 🔗
February 1, 2003
The Space Shuttle Columbia disintegrates upon re-entry, killing all seven crew members and halting the shuttle program for over two years. (Age: 61 years and 4 months) 🔗
March 20, 2003
The U.S. and a coalition of allies invade Iraq, marking the beginning of the Iraq War. (Age: 61 years and 6 months) 🔗
February 4, 2004
Mark Zuckerberg launches "The Facebook," initially limited to Harvard students, which later becomes the global social media giant. (Age: 62 years and 4 months) 🔗
December 26, 2004
The Indian Ocean earthquake and tsunami devastates coastal regions across 14 countries, killing over 230,000 people. (Age: 63 years and 3 months) 🔗
August 29, 2005
Hurricane Katrina strikes the U.S. Gulf Coast, causing massive damage and flooding in New Orleans, leading to major government criticism. (Age: 63 years and 11 months) 🔗
March 21, 2006
Twitter is founded, allowing users to share short messages, quickly becoming a major platform for real-time communication. (Age: 64 years and 6 months) 🔗

Birthday-FAQ for Dennis Ritchie

Frequently asked questions

How many birthday candles did Dennis Ritchie blow out so far?

» At 70 years, Dennis Ritchie has already blown out 2485 birthday candles, if you add up all the birthdays.

When will Dennis Ritchie be twice as old as today?

» Dennis Ritchie ist 25.600 days old today. On 13.11.2081 Dennis Ritchie will be twice as old as today. Dennis Ritchie will then be 140 Jahre und 2 Monate years old.

When will Dennis Ritchie be half as old as today?

» On 25.09.1976 Dennis Ritchie was half of age today. Back then Dennis Ritchie were 35 Jahre und 0 Monate years old.

When was Dennis Ritchie conceived? - Time of your conception

» That's an interesting question. Let's try it this way: A pregnancy lasts an average of 268 days. If we subtract 268 days from the day of your birth (15.12.1940), we get the 15.12.1940. However, this statement is not very meaningful, since only 3% of pregnant women actually give birth after 268 days. Most pregnant women give birth within a time window of 10 days from the actual due date. Therefore, Dennis Ritchie were conceived between 05.12.1940 and 25.12.1940.

How many prime number birthdays has Dennis Ritchie had so far?

» At 70 years old, Dennis Ritchie has already celebrated 19 prime number birthdays (2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67).

How many special birthdays have I had so far?

» At 70 years, you've already celebrated 6 special number birthdays (11, 22, 33, 44, 55, 66). To be able to celebrate 10 special number birthdays, you have to live to be 111. But you still have some time until then. You'll celebrate your 111th birthday on 09.09.2052. You can find out more on the page with all birthdays.

How old was Dennis Ritchie at the turn of the millennium in 2000?

» Dennis Ritchie was born exactly 21298 days before the turn of the millennium in January 1, 2000. At that time, Dennis Ritchie was 58 years and 3 months old.

Oldest person in the world

Dennis Ritchie is currently 52 years younger (44720 days) than the officially oldest person in the world, the Frenchwoman Jeanne Calment. She was born on February 21, 1875 and died on August 4, 1997 at the age of 122 years and 164 days.

Dennis Ritchie has lived 20385 days longer than he/she was dead.

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Disclaimer

Some content and calculations were generated using AI. The content is not guaranteed to be accurate or complete. If you notice an error, you can report it using our contact form.

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