53 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 53 years old now, what year was he born? See below:

If 53 years old, year of birth is:
1971 or 1972*

*It depends on whether he was born before or after 1 January 1972.

If now 53 years and his year of birth 1971 if he was born after 19 December 1971 until 31 december 1971 inclusively, and his year of birth is 1972 if he was born from 1 January 1972 to 19 December 1972.

Other examples:

If now 10 years, year of birth 2014 or 2015
If now 13 years, year of birth 2011 or 2012
If now 28 years, year of birth 1996 or 1997
If now 92 years, year of birth 1932 or 1933

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