42 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 42 years old now, what year was he born? See below:

If 42 years old, year of birth is:
1982 or 1983*

*It depends on whether he was born before or after 1 January 1983.

If now 42 years and his year of birth 1982 if he was born after 19 December 1982 until 31 december 1982 inclusively, and his year of birth is 1983 if he was born from 1 January 1983 to 19 December 1983.

Other examples:

If now 9 years, year of birth 2015 or 2016
If now 17 years, year of birth 2007 or 2008
If now 21 years, year of birth 2003 or 2004
If now 94 years, year of birth 1930 or 1931

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