43 years old now in 2025 - what year born?

Today, 19 December 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 19 December 1981 until 31 december 1981 inclusively, and his year of birth is 1982 if he was born from 1 January 1982 to 19 December 1982.

Other examples:

If now 3 years, year of birth 2021 or 2022
If now 14 years, year of birth 2010 or 2011
If now 23 years, year of birth 2001 or 2002
If now 92 years, year of birth 1932 or 1933

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