42 years old now in 2025 - what year born?

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

Other examples:

If now 7 years, year of birth 2017 or 2018
If now 17 years, year of birth 2007 or 2008
If now 27 years, year of birth 1997 or 1998
If now 54 years, year of birth 1970 or 1971

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