75 years old now in 2025 - what year born?

Today, 20 March 2025 if a person is 75 years old now, what year was he born? See below:

If 75 years old, year of birth is:
1949 or 1950*

*It depends on whether he was born before or after 1 January 1950.

If now 75 years and his year of birth 1949 if he was born after 20 March 1949 until 31 december 1949 inclusively, and his year of birth is 1950 if he was born from 1 January 1950 to 20 March 1950.

Other examples:

If now 4 years, year of birth 2020 or 2021
If now 17 years, year of birth 2007 or 2008
If now 19 years, year of birth 2005 or 2006
If now 47 years, year of birth 1977 or 1978

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