65 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 65 years old now, what year was he born? See below:

If 65 years old, year of birth is:
1959 or 1960*

*It depends on whether he was born before or after 1 January 1960.

If now 65 years and his year of birth 1959 if he was born after 19 December 1959 until 31 december 1959 inclusively, and his year of birth is 1960 if he was born from 1 January 1960 to 19 December 1960.

Other examples:

If now 6 years, year of birth 2018 or 2019
If now 18 years, year of birth 2006 or 2007
If now 22 years, year of birth 2002 or 2003
If now 90 years, year of birth 1934 or 1935

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