35 years old now in 2025 - what year born?

Today, 8 July 2025 if a person is 35 years old now, what year was he born? See below:

If 35 years old, year of birth is:
1989 or 1990*

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

If now 35 years and his year of birth 1989 if he was born after 8 July 1989 until 31 december 1989 inclusively, and his year of birth is 1990 if he was born from 1 January 1990 to 8 July 1990.

Other examples:

If now 6 years, year of birth 2018 or 2019
If now 14 years, year of birth 2010 or 2011
If now 26 years, year of birth 1998 or 1999
If now 63 years, year of birth 1961 or 1962

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