52 years old now in 2025 - what year born?

Today, 19 December 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 19 December 1972 until 31 december 1972 inclusively, and his year of birth is 1973 if he was born from 1 January 1973 to 19 December 1973.

Other examples:

If now 4 years, year of birth 2020 or 2021
If now 17 years, year of birth 2007 or 2008
If now 24 years, year of birth 2000 or 2001
If now 77 years, year of birth 1947 or 1948

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