73 years old now in 2025 - what year born?

Today, 22 April 2025 if a person is 73 years old now, what year was he born? See below:

If 73 years old, year of birth is:
1951 or 1952*

*It depends on whether he was born before or after 1 January 1952.

If now 73 years and his year of birth 1951 if he was born after 22 April 1951 until 31 december 1951 inclusively, and his year of birth is 1952 if he was born from 1 January 1952 to 22 April 1952.

Other examples:

If now 7 years, year of birth 2017 or 2018
If now 17 years, year of birth 2007 or 2008
If now 23 years, year of birth 2001 or 2002
If now 50 years, year of birth 1974 or 1975

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