72 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 72 years old now, what year was he born? See below:

If 72 years old, year of birth is:
1952 or 1953*

*It depends on whether he was born before or after 1 January 1953.

If now 72 years and his year of birth 1952 if he was born after 19 December 1952 until 31 december 1952 inclusively, and his year of birth is 1953 if he was born from 1 January 1953 to 19 December 1953.

Other examples:

If now 11 years, year of birth 2013 or 2014
If now 15 years, year of birth 2009 or 2010
If now 20 years, year of birth 2004 or 2005
If now 85 years, year of birth 1939 or 1940

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