81 years old now in 2025 - what year born?

Today, 19 December 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 19 December 1943 until 31 december 1943 inclusively, and his year of birth is 1944 if he was born from 1 January 1944 to 19 December 1944.

Other examples:

If now 10 years, year of birth 2014 or 2015
If now 13 years, year of birth 2011 or 2012
If now 24 years, year of birth 2000 or 2001
If now 92 years, year of birth 1932 or 1933

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