34 years old now in 2024 - what year born?

Today, 15 September 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 15 September 1989 until 31 december 1989 inclusively, and his year of birth is 1990 if he was born from 1 January 1990 to 15 September 1990.

Other examples:

If now 5 years, year of birth 2018 or 2019
If now 16 years, year of birth 2007 or 2008
If now 23 years, year of birth 2000 or 2001
If now 73 years, year of birth 1950 or 1951

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