43 years old now in 2025 - what year born?

Today, 23 January 2025 if a person is 43 years old now, what year was he born? See below:

If 43 years old, year of birth is:
1981 or 1982*

*It depends on whether he was born before or after 1 January 1982.

If now 43 years and his year of birth 1981 if he was born after 23 January 1981 until 31 december 1981 inclusively, and his year of birth is 1982 if he was born from 1 January 1982 to 23 January 1982.

Other examples:

If now 4 years, year of birth 2020 or 2021
If now 15 years, year of birth 2009 or 2010
If now 30 years, year of birth 1994 or 1995
If now 65 years, year of birth 1959 or 1960

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