Reverse Years

Riddle: In 1990, a person is 15 years old. In 1995 that same person is 10 years old. How is this possible?

Answer: The years are in B.C.

Source: https://www.riddles.com/index.php/672

In 1990, a person is 15 years old. In 1995 that same person is 10 years old. How is this possible? — Reverse years by Anonymous v1.

Riddle: In 1990, a person is 15 years old. In 1995 that same person is 10 years old. How is this possible? Answer: The years are in B.C. — by Anonymous v2.