Riddle: A person was born in 1940. Today is his 18th birthday. How is that possible?

Answer 1

Person was born on 29th Feb 1940

As we know leap year has 366 Days. i.e. 29th Feb. and 1940 was leap year and since 1940 29th feb has appeared 18 times only.

Answer 2

he was born on 29th feb in 1940.