71 years old now in 2023 - what year born?

Today, 1 December 2023 if a person is 71 years old now, what year was he born? See below:

If 71 years old, year of birth is:
1951 or 1952*

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

If now 71 years and his year of birth 1951 if he was born after 1 December 1951 until 31 december 1951 inclusively, and his year of birth is 1952 if he was born from 1 January 1952 to 1 December 1952.

Other examples:

If now 8 years, year of birth 2014 or 2015
If now 14 years, year of birth 2008 or 2009
If now 30 years, year of birth 1992 or 1993
If now 41 years, year of birth 1981 or 1982

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