34 years old now in 2025 - what year born?

Today, 21 May 2025 if a person is 34 years old now, what year was he born? See below:

If 34 years old, year of birth is:
1990 or 1991*

*It depends on whether he was born before or after 1 January 1991.

If now 34 years and his year of birth 1990 if he was born after 21 May 1990 until 31 december 1990 inclusively, and his year of birth is 1991 if he was born from 1 January 1991 to 21 May 1991.

Other examples:

If now 3 years, year of birth 2021 or 2022
If now 17 years, year of birth 2007 or 2008
If now 22 years, year of birth 2002 or 2003
If now 52 years, year of birth 1972 or 1973

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