Does anybody need to calculate their age? It’s not a hard thing to remember :|

its just 11 + the current year.
I am 1988 so i am 12 + the current year.

Didn’t think of it like that until your post but it is pretty easy.

On the other hand, it makes it easier for the people who have to check your ID when buying alcohol. Any birth year that begins with 19 is automatically old enough.