81 years old now in 2024 - what year born?

Today, 15 October 2024 if a person is 81 years old now, what year was he born? See below:

If 81 years old, year of birth is:
1942 or 1943*

*It depends on whether he was born before or after 1 January 1943.

If now 81 years and his year of birth 1942 if he was born after 15 October 1942 until 31 december 1942 inclusively, and his year of birth is 1943 if he was born from 1 January 1943 to 15 October 1943.

Other examples:

If now 10 years, year of birth 2013 or 2014
If now 13 years, year of birth 2010 or 2011
If now 19 years, year of birth 2004 or 2005
If now 98 years, year of birth 1925 or 1926

HTML code:

BB code: