a man once said: 2 days ago i was 18 yrs. old next year i"ll be 21 yrs. old

It seems to me regardless of when the man was born the statement is false.

birth day on february 29?

when he says that, its march 2nd

2 days ago (april 29) he was 18, so next year (leap year) he'll be 21?

my guess is as good as yours

Has this something to do with the transition from BC to AD ?

He was born December 30th? Wait never mind that would be 2 years later.

His Birthday is December 31st
The statement was made Jan 1st

That would make him 20. Not 21.

"a man once said: 2 days ago i was 18 yrs. old next year i"ll be 21 yrs. old"

Say it is Jan 1st 2007
2 days ago (Dec. 30th, 2006) he was 18
On Dec. 31st, 2006 (his Birthday) he turned 19
So, in 2007 on Dec. 31st he will be 20 years old and next year he will 21.

Maybe that makes more sense?

Perfect sense! Thanks TTH!