Relevant question for driving, voting, marrying, drinking. I'd assume just the date is compared. If you are born on 29th, on future 28th you are considered "to

Relevant question for driving, voting, marrying, drinking. I'd assume just the date is compared. If you are born on 29th, on future 28th you are considered "too young", regardless whether a 29th exists or not. On future March 1st you are "old enough" again regardless. If a 29th exists you are old enough already on that date. Drinking beer in Germany at 16, I guess in some countries at 20 could be relevant cases. For the more common minimum age of 18 for many things, the limit is reached always on March, 1st because a 29th cannot exist.