Riddle: A man dies of old age on his 25th birthday. How is this possible?
Answer: The correct answer is 100.
He was born on Feb. 29. This means that he had a birthday every 4 years, so he is 25×4=100 years! or;
They had born on February 29 (a leap year). So when he had celebrated his 25th birthday he is actually 25×4=100 years old!