43 years old now in 2025 - what year born?

Today, 21 May 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 21 May 1981 until 31 december 1981 inclusively, and his year of birth is 1982 if he was born from 1 January 1982 to 21 May 1982.

Other examples:

If now 11 years, year of birth 2013 or 2014
If now 14 years, year of birth 2010 or 2011
If now 20 years, year of birth 2004 or 2005
If now 69 years, year of birth 1955 or 1956

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