49 years old now in 2025 - what year born?

Today, 19 December 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 19 December 1975 until 31 december 1975 inclusively, and his year of birth is 1976 if he was born from 1 January 1976 to 19 December 1976.

Other examples:

If now 5 years, year of birth 2019 or 2020
If now 15 years, year of birth 2009 or 2010
If now 19 years, year of birth 2005 or 2006
If now 47 years, year of birth 1977 or 1978

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