63 years old now in 2023 - what year born?

Today, 1 December 2023 if a person is 63 years old now, what year was he born? See below:

If 63 years old, year of birth is:
1959 or 1960*

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

If now 63 years and his year of birth 1959 if he was born after 1 December 1959 until 31 december 1959 inclusively, and his year of birth is 1960 if he was born from 1 January 1960 to 1 December 1960.

Other examples:

If now 10 years, year of birth 2012 or 2013
If now 14 years, year of birth 2008 or 2009
If now 23 years, year of birth 1999 or 2000
If now 38 years, year of birth 1984 or 1985

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