49 years old now in 2025 - what year born?

Today, 18 January 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 18 January 1975 until 31 december 1975 inclusively, and his year of birth is 1976 if he was born from 1 January 1976 to 18 January 1976.

Other examples:

If now 10 years, year of birth 2014 or 2015
If now 15 years, year of birth 2009 or 2010
If now 29 years, year of birth 1995 or 1996
If now 32 years, year of birth 1992 or 1993

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