52 years old now in 2023 - what year born?

Today, 26 March 2023 if a person is 52 years old now, what year was he born? See below:

If 52 years old, year of birth is:
1970 or 1971*

*It depends on whether he was born before or after 1 January 1971.

If now 52 years and his year of birth 1970 if he was born after 26 March 1970 until 31 december 1970 inclusively, and his year of birth is 1971 if he was born from 1 January 1971 to 26 March 1971.

Other examples:

If now 10 years, year of birth 2012 or 2013
If now 18 years, year of birth 2004 or 2005
If now 29 years, year of birth 1993 or 1994
If now 61 years, year of birth 1961 or 1962

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