42 years old now in 2025 - what year born?

Today, 16 January 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 16 January 1982 until 31 december 1982 inclusively, and his year of birth is 1983 if he was born from 1 January 1983 to 16 January 1983.

Other examples:

If now 12 years, year of birth 2012 or 2013
If now 14 years, year of birth 2010 or 2011
If now 28 years, year of birth 1996 or 1997
If now 69 years, year of birth 1955 or 1956

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