I've just turned 34 and my colleague is 20. I'm not by any means the oldest person who works there but most of our colleagues are male, which may be relevant. Anyway, we get on fine but she likes to take ANY opportunity to bring up the fact that she's much younger than me, the implication being that getting older is a really negative thing. I've never given any indication that I feel old or 'past it,' it's not something I really think about (without these weird reminders 😄) and she never says stuff like this to the men there.
Vague example: she'll talk about something she likes and I'll say I prefer something else and she'll say 'that's because of your AGE.'
What's the point?