61 years old now in 2025 - what year born?

Today, 18 January 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 18 January 1963 until 31 december 1963 inclusively, and his year of birth is 1964 if he was born from 1 January 1964 to 18 January 1964.

Other examples:

If now 11 years, year of birth 2013 or 2014
If now 15 years, year of birth 2009 or 2010
If now 30 years, year of birth 1994 or 1995
If now 39 years, year of birth 1985 or 1986

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