50 years old now in 2025 - what year born?

Today, 16 January 2025 if a person is 50 years old now, what year was he born? See below:

If 50 years old, year of birth is:
1974 or 1975*

*It depends on whether he was born before or after 1 January 1975.

If now 50 years and his year of birth 1974 if he was born after 16 January 1974 until 31 december 1974 inclusively, and his year of birth is 1975 if he was born from 1 January 1975 to 16 January 1975.

Other examples:

If now 11 years, year of birth 2013 or 2014
If now 17 years, year of birth 2007 or 2008
If now 23 years, year of birth 2001 or 2002
If now 100 years, year of birth 1924 or 1925

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