34 years old now in 2025 - what year born?

Today, 18 January 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 18 January 1990 until 31 december 1990 inclusively, and his year of birth is 1991 if he was born from 1 January 1991 to 18 January 1991.

Other examples:

If now 5 years, year of birth 2019 or 2020
If now 13 years, year of birth 2011 or 2012
If now 26 years, year of birth 1998 or 1999
If now 65 years, year of birth 1959 or 1960

HTML code:

BB code: