60 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 60 years old now, what year was he born? See below:

If 60 years old, year of birth is:
1964 or 1965*

*It depends on whether he was born before or after 1 January 1965.

If now 60 years and his year of birth 1964 if he was born after 19 December 1964 until 31 december 1964 inclusively, and his year of birth is 1965 if he was born from 1 January 1965 to 19 December 1965.

Other examples:

If now 4 years, year of birth 2020 or 2021
If now 14 years, year of birth 2010 or 2011
If now 25 years, year of birth 1999 or 2000
If now 100 years, year of birth 1924 or 1925

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