I think it's fairly common that people do some math in their head, specially when they get older than 30. Because it doesn't matter really, you never need to tell anyone how old you are anymore. Well unless you use dating apps I guess, or date people... Nobody else asks your age.
It's been a hot minute since I've been on one of those apps but do they not just ask for your birthday and simply calculate your age...? Surely dating apps don't require you to update your age manually every year right...
I guess if you're not using an app then sure but you could just as well tell your birth year and if it's close enough it's probably fine. 🤷