81 years old now in 2025 - what year born?

Today, 18 January 2025 if a person is 81 years old now, what year was he born? See below:

If 81 years old, year of birth is:
1943 or 1944*

*It depends on whether he was born before or after 1 January 1944.

If now 81 years and his year of birth 1943 if he was born after 18 January 1943 until 31 december 1943 inclusively, and his year of birth is 1944 if he was born from 1 January 1944 to 18 January 1944.

Other examples:

If now 11 years, year of birth 2013 or 2014
If now 12 years, year of birth 2012 or 2013
If now 24 years, year of birth 2000 or 2001
If now 48 years, year of birth 1976 or 1977

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