73 years old now in 2025 - what year born?

Today, 19 December 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 19 December 1951 until 31 december 1951 inclusively, and his year of birth is 1952 if he was born from 1 January 1952 to 19 December 1952.

Other examples:

If now 11 years, year of birth 2013 or 2014
If now 13 years, year of birth 2011 or 2012
If now 28 years, year of birth 1996 or 1997
If now 74 years, year of birth 1950 or 1951

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