52 years old now in 2025 - what year born?

Today, 16 January 2025 if a person is 52 years old now, what year was he born? See below:

If 52 years old, year of birth is:
1972 or 1973*

*It depends on whether he was born before or after 1 January 1973.

If now 52 years and his year of birth 1972 if he was born after 16 January 1972 until 31 december 1972 inclusively, and his year of birth is 1973 if he was born from 1 January 1973 to 16 January 1973.

Other examples:

If now 7 years, year of birth 2017 or 2018
If now 16 years, year of birth 2008 or 2009
If now 21 years, year of birth 2003 or 2004
If now 76 years, year of birth 1948 or 1949

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