72 years old now in 2023 - what year born?

Today, 1 December 2023 if a person is 72 years old now, what year was he born? See below:

If 72 years old, year of birth is:
1950 or 1951*

*It depends on whether he was born before or after 1 January 1951.

If now 72 years and his year of birth 1950 if he was born after 1 December 1950 until 31 december 1950 inclusively, and his year of birth is 1951 if he was born from 1 January 1951 to 1 December 1951.

Other examples:

If now 10 years, year of birth 2012 or 2013
If now 14 years, year of birth 2008 or 2009
If now 30 years, year of birth 1992 or 1993
If now 86 years, year of birth 1936 or 1937

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