52 years old now in 2023 - what year born?

Today, 26 September 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 September 1970 until 31 december 1970 inclusively, and his year of birth is 1971 if he was born from 1 January 1971 to 26 September 1971.

Other examples:

If now 11 years, year of birth 2011 or 2012
If now 13 years, year of birth 2009 or 2010
If now 21 years, year of birth 2001 or 2002
If now 91 years, year of birth 1931 or 1932

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