34 years old now in 2025 - what year born?

Today, 19 December 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 19 December 1990 until 31 december 1990 inclusively, and his year of birth is 1991 if he was born from 1 January 1991 to 19 December 1991.

Other examples:

If now 4 years, year of birth 2020 or 2021
If now 18 years, year of birth 2006 or 2007
If now 24 years, year of birth 2000 or 2001
If now 89 years, year of birth 1935 or 1936

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