Celebrity
According to the writers, it took two years for Rachel to exit 29 and enter her 30s.
Meanwhile, the rest of the friends only have one celebration in the series at best.
Its generally accepted among the fandom that one season ofFriendswould typically capture about a year.

Time wasnt the only thing thatFriendsgot confused.
Either the writers simply cant keep track of history, or Rachels a huge liar.




source: www.bustle.com