74 years old now in 2025 - what year born?

Today, 19 March 2025 if a person is 74 years old now, what year was he born? See below:

If 74 years old, year of birth is:
1950 or 1951*

*It depends on whether he was born before or after 1 January 1951.

If now 74 years and his year of birth 1950 if he was born after 19 March 1950 until 31 december 1950 inclusively, and his year of birth is 1951 if he was born from 1 January 1951 to 19 March 1951.

Other examples:

If now 9 years, year of birth 2015 or 2016
If now 14 years, year of birth 2010 or 2011
If now 24 years, year of birth 2000 or 2001
If now 45 years, year of birth 1979 or 1980

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