72 years old now in 2024 - what year born?

Today, 12 September 2024 if a person is 72 years old now, what year was he born? See below:

If 72 years old, year of birth is:
1951 or 1952*

*It depends on whether he was born before or after 1 January 1952.

If now 72 years and his year of birth 1951 if he was born after 12 September 1951 until 31 december 1951 inclusively, and his year of birth is 1952 if he was born from 1 January 1952 to 12 September 1952.

Other examples:

If now 5 years, year of birth 2018 or 2019
If now 12 years, year of birth 2011 or 2012
If now 22 years, year of birth 2001 or 2002
If now 86 years, year of birth 1937 or 1938

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