35 years old now in 2024 - what year born?

Today, 4 December 2024 if a person is 35 years old now, what year was he born? See below:

If 35 years old, year of birth is:
1988 or 1989*

*It depends on whether he was born before or after 1 January 1989.

If now 35 years and his year of birth 1988 if he was born after 4 December 1988 until 31 december 1988 inclusively, and his year of birth is 1989 if he was born from 1 January 1989 to 4 December 1989.

Other examples:

If now 10 years, year of birth 2013 or 2014
If now 12 years, year of birth 2011 or 2012
If now 28 years, year of birth 1995 or 1996
If now 82 years, year of birth 1941 or 1942

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