61 years old now in 2025 - what year born?

Today, 21 May 2025 if a person is 61 years old now, what year was he born? See below:

If 61 years old, year of birth is:
1963 or 1964*

*It depends on whether he was born before or after 1 January 1964.

If now 61 years and his year of birth 1963 if he was born after 21 May 1963 until 31 december 1963 inclusively, and his year of birth is 1964 if he was born from 1 January 1964 to 21 May 1964.

Other examples:

If now 7 years, year of birth 2017 or 2018
If now 13 years, year of birth 2011 or 2012
If now 29 years, year of birth 1995 or 1996
If now 81 years, year of birth 1943 or 1944

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