No, the clock doesn't really start to tick until you're 36.
5 seconds sound clip from the When Harry Met Sally... movie soundboard.
You can hear this line at 00:24:13 in the Blu-ray version of the movie.
Quote context
[...]
- For God's sake, Marie, don't you have any feelings about this? She's obviously upset.
- I'm not that upset. We'd been growing apart for quite a while.
- But you guys were a couple. You had someone to go places with. You had a date on national holidays!
- I said to myself, you deserve more than this. You're 31 years old.
- No, the clock doesn't really start to tick until you're 36.
- God, you're in such great shape.
- Well, I've had a few days to get used to it, and I feel OK.
- Well, how else do you think you do it?
[...]