34 years old now in 2023 - what year born?

Today, 1 December 2023 if a person is 34 years old now, what year was he born? See below:

If 34 years old, year of birth is:
1988 or 1989*

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

If now 34 years and his year of birth 1988 if he was born after 1 December 1988 until 31 december 1988 inclusively, and his year of birth is 1989 if he was born from 1 January 1989 to 1 December 1989.

Other examples:

If now 6 years, year of birth 2016 or 2017
If now 15 years, year of birth 2007 or 2008
If now 28 years, year of birth 1994 or 1995
If now 89 years, year of birth 1933 or 1934

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