49 years old now in 2025 - what year born?

Today, 21 May 2025 if a person is 49 years old now, what year was he born? See below:

If 49 years old, year of birth is:
1975 or 1976*

*It depends on whether he was born before or after 1 January 1976.

If now 49 years and his year of birth 1975 if he was born after 21 May 1975 until 31 december 1975 inclusively, and his year of birth is 1976 if he was born from 1 January 1976 to 21 May 1976.

Other examples:

If now 3 years, year of birth 2021 or 2022
If now 16 years, year of birth 2008 or 2009
If now 27 years, year of birth 1997 or 1998
If now 78 years, year of birth 1946 or 1947

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