[mellampudi]

only a few days more than what they would have had they been born on any other day (number of extra days = (number of years he has lived) / 4)

[Xichekolas]

I was thinking that if they could only celebrate their birthday every four years, they would only age at 1/4 the rate. Their 80th birthday would happen 320 years after being born.

Of course, this is all rather silly.