80 years old now in 2025 - what year born?

Today, 21 May 2025 if a person is 80 years old now, what year was he born? See below:

If 80 years old, year of birth is:
1944 or 1945*

*It depends on whether he was born before or after 1 January 1945.

If now 80 years and his year of birth 1944 if he was born after 21 May 1944 until 31 december 1944 inclusively, and his year of birth is 1945 if he was born from 1 January 1945 to 21 May 1945.

Other examples:

If now 6 years, year of birth 2018 or 2019
If now 14 years, year of birth 2010 or 2011
If now 27 years, year of birth 1997 or 1998
If now 89 years, year of birth 1935 or 1936

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