83 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 83 years old now, what year was he born? See below:

If 83 years old, year of birth is:
1941 or 1942*

*It depends on whether he was born before or after 1 January 1942.

If now 83 years and his year of birth 1941 if he was born after 19 December 1941 until 31 december 1941 inclusively, and his year of birth is 1942 if he was born from 1 January 1942 to 19 December 1942.

Other examples:

If now 4 years, year of birth 2020 or 2021
If now 18 years, year of birth 2006 or 2007
If now 19 years, year of birth 2005 or 2006
If now 72 years, year of birth 1952 or 1953

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