83 years old now in 2025 - what year born?

Today, 19 April 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 April 1941 until 31 december 1941 inclusively, and his year of birth is 1942 if he was born from 1 January 1942 to 19 April 1942.

Other examples:

If now 7 years, year of birth 2017 or 2018
If now 17 years, year of birth 2007 or 2008
If now 19 years, year of birth 2005 or 2006
If now 54 years, year of birth 1970 or 1971

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