73 years old now in 2025 - what year born?

Today, 23 January 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 23 January 1951 until 31 december 1951 inclusively, and his year of birth is 1952 if he was born from 1 January 1952 to 23 January 1952.

Other examples:

If now 10 years, year of birth 2014 or 2015
If now 12 years, year of birth 2012 or 2013
If now 18 years, year of birth 2006 or 2007
If now 99 years, year of birth 1925 or 1926

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