81 years old now in 2025 - what year born?

Today, 21 May 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 21 May 1943 until 31 december 1943 inclusively, and his year of birth is 1944 if he was born from 1 January 1944 to 21 May 1944.

Other examples:

If now 12 years, year of birth 2012 or 2013
If now 13 years, year of birth 2011 or 2012
If now 25 years, year of birth 1999 or 2000
If now 68 years, year of birth 1956 or 1957

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