I've always been wondering, when the birthday of the character was, so I tried to gather some information on that. Please let me know what you think. If you have further proofs or oddities, I would like to know them.
Didi
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Rachel Karen Green: =================== (Jennifer Aniston, February 11, 1969)
May 5th, 1969
- May 5th was established in 405 - TOW Joey's new girlfriend - In March 1998 (416 - TOW The Fake Party), shortly before her birthday, she states, that she is 28, so her birthyear must be 1969
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Monica E. Geller: ================= (Courteney Cox Arquette, June 15, 1964)
April, 1969
- In 122 - TOW the ick factor (aired May 1994), Monica states, she is 25 and 13 months
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Phoebe Buffay: ============== (Lisa Kudrow, July 30, 1963)
February 16th, 1968
- Phoebe states that her birthday is February 16th in 305 - TOW Frank Jr. - In 401 - TOW the jellyfish (aired 09/25/1997) she tells her mother, that she had 29 years to find out, that Phoebe was a cool person. So her birthyear is probably 1968
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Joey Tribbiani ============== (Matt LeBlanc, July 25, 1967)
January, 1969
- In 701 - TOW Monica's thunder, it is affirmed, that Joey is 31. - In 311 - TOW Chandler can't remember which sister (aired on 01/09/1997) they are celebrating Joey's birthday.
Oddities: - In 216 - TOW Joey moves out, he states, that he is 28, which would establish is birthyear in 1968, but he also got his own age wrong in 701, so let's assume, the others are right with his age. At that time, the actor Matt LeBlanc was 28, so it's also possible, that he stated his own age by mistake.
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Chandler Bing ============= (Matthew Perry, 19 August 1969)
Mid-April, 1969
- In 518 - TOW Where Rachel Smokes (aired 04/08/1999), the gang is planning a surprise party for Rachel. Joey states, that it's not for another month. At the end of the show, Rachel says, that Chandler's birthday is even before hers, so Chandler's birthmonth is probably April. - Another hint for Mid-April is, that in 617 - TOW the Unagi, which takes place two weeks after Valentine's Day (2/14), Monica says, that Chandler's birthday is in one and a half months. - In 109 - TOW Underdog gets away, Chandler tells the story, where he was nine, and his parents decided to get divorced on Thanksgiving. In 508 - TOW The Thanksgiving Flashbacks, Chandler tells the story again, and the subtitle says, it's Thanksgiving 1978.
Oddities: - It was told throughout the series, that Chandler and Ross were College mates. So, they should actually be of same age.
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Ross Geller =========== (David Schwimmer, November 12, 1966)
December, 1967
- In 405 - TOW Joey's new girlfriend he says, his birthmonth is December. - In 624 - TOW the proposal, we learn that Ross is 32, since his girlfriend Elizabeth is 20 (as stated in 618 - TOW Ross Dates A Student) and Phoebe says that he is 12 years older than she.
Oddities: - In 104 - TOW George Stephanopoulos (aired 10/13/1994) they say it's October 20th. Ross states in this episode, that his birthday was seven months ago, which then would be March. - In 205 - TOW Five Steaks and an Eggplant (aired 10/19/1995) they say it's Ross' birthday, which is far away from both March and December.