61 years old now in 2023 - what year born?

Today, 29 May 2023 if a person is 61 years old now, what year was he born? See below:

If 61 years old, year of birth is:
1961 or 1962*

*It depends on whether he was born before or after 1 January 1962.

If now 61 years and his year of birth 1961 if he was born after 29 May 1961 until 31 december 1961 inclusively, and his year of birth is 1962 if he was born from 1 January 1962 to 29 May 1962.

Other examples:

If now 5 years, year of birth 2017 or 2018
If now 17 years, year of birth 2005 or 2006
If now 21 years, year of birth 2001 or 2002
If now 52 years, year of birth 1970 or 1971

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