60 years old now in 2023 - what year born?

Today, 1 December 2023 if a person is 60 years old now, what year was he born? See below:

If 60 years old, year of birth is:
1962 or 1963*

*It depends on whether he was born before or after 1 January 1963.

If now 60 years and his year of birth 1962 if he was born after 1 December 1962 until 31 december 1962 inclusively, and his year of birth is 1963 if he was born from 1 January 1963 to 1 December 1963.

Other examples:

If now 5 years, year of birth 2017 or 2018
If now 14 years, year of birth 2008 or 2009
If now 20 years, year of birth 2002 or 2003
If now 63 years, year of birth 1959 or 1960

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