83 years old now in 2024 - what year born?

Today, 10 October 2024 if a person is 83 years old now, what year was he born? See below:

If 83 years old, year of birth is:
1940 or 1941*

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

If now 83 years and his year of birth 1940 if he was born after 10 October 1940 until 31 december 1940 inclusively, and his year of birth is 1941 if he was born from 1 January 1941 to 10 October 1941.

Other examples:

If now 4 years, year of birth 2019 or 2020
If now 13 years, year of birth 2010 or 2011
If now 21 years, year of birth 2002 or 2003
If now 61 years, year of birth 1962 or 1963

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