34 years old now in 2023 - what year born?

Today, 27 March 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 27 March 1988 until 31 december 1988 inclusively, and his year of birth is 1989 if he was born from 1 January 1989 to 27 March 1989.

Other examples:

If now 10 years, year of birth 2012 or 2013
If now 18 years, year of birth 2004 or 2005
If now 26 years, year of birth 1996 or 1997
If now 57 years, year of birth 1965 or 1966

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