34 years old now in 2024 - what year born?

Today, 20 April 2024 if a person is 34 years old now, what year was he born? See below:

If 34 years old, year of birth is:
1989 or 1990*

*It depends on whether he was born before or after 1 January 1990.

If now 34 years and his year of birth 1989 if he was born after 20 April 1989 until 31 december 1989 inclusively, and his year of birth is 1990 if he was born from 1 January 1990 to 20 April 1990.

Other examples:

If now 10 years, year of birth 2013 or 2014
If now 18 years, year of birth 2005 or 2006
If now 19 years, year of birth 2004 or 2005
If now 42 years, year of birth 1981 or 1982

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