61 years old now in 2025 - what year born?

Today, 19 December 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 19 December 1963 until 31 december 1963 inclusively, and his year of birth is 1964 if he was born from 1 January 1964 to 19 December 1964.

Other examples:

If now 4 years, year of birth 2020 or 2021
If now 15 years, year of birth 2009 or 2010
If now 19 years, year of birth 2005 or 2006
If now 78 years, year of birth 1946 or 1947

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