52 years old now in 2025 - what year born?

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

Other examples:

If now 3 years, year of birth 2021 or 2022
If now 12 years, year of birth 2012 or 2013
If now 26 years, year of birth 1998 or 1999
If now 99 years, year of birth 1925 or 1926

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