[hattmall]

You certainly don't have to lie, but there's no reason you can't simply calculate your age differently. The common 365 days to a year for age isn't a universal given.

[Natsu]

You'll be a little less than half as old if you pretend to be a Martian with their 687 Earth days per Martian year.

Just don't go with Neptune, it takes almost 165 years before you turn 1 there.

[Tommah]

My grandfather used to say that he was "35 and a few months."