I normally just tell them "it was a few weeks back". This gives a full year for them to forget about it and has a sufficiently vague period of time that they can't nail you next year should they remember.

> I try to tell people I don't have a birthday anymore.

Never thought of that. I'd imagine the ensuing conversation is even more problematic though? "What do you mean you don't have a birthday? That makes no sense!"

No, just respond with "I stopped caring".

Maybe could also tack on that you count winters to tell your age.

I mean it usually goes "No really? When's your birthday" "I don't have one, thanks" and usually dies off from there.

I mean, if I have to put it on a form, that's one thing, but like office people don't need to know when it is.