82 years old now in 2023 - what year born?

Today, 1 December 2023 if a person is 82 years old now, what year was he born? See below:

If 82 years old, year of birth is:
1940 or 1941*

*It depends on whether he was born before or after 1 January 1941.

If now 82 years and his year of birth 1940 if he was born after 1 December 1940 until 31 december 1940 inclusively, and his year of birth is 1941 if he was born from 1 January 1941 to 1 December 1941.

Other examples:

If now 9 years, year of birth 2013 or 2014
If now 13 years, year of birth 2009 or 2010
If now 30 years, year of birth 1992 or 1993
If now 83 years, year of birth 1939 or 1940

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