71 years old now in 2023 - what year born?

Today, 26 March 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 26 March 1951 until 31 december 1951 inclusively, and his year of birth is 1952 if he was born from 1 January 1952 to 26 March 1952.

Other examples:

If now 9 years, year of birth 2013 or 2014
If now 17 years, year of birth 2005 or 2006
If now 26 years, year of birth 1996 or 1997
If now 92 years, year of birth 1930 or 1931

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