29 years old now in 2023 - what year born?

Today, 24 September 2023 if a person is 29 years old now, what year was he born? See below:

If 29 years old, year of birth is:
1993 or 1994*

*It depends on whether he was born before or after 1 January 1994.

If now 29 years and his year of birth 1993 if he was born after 24 September 1993 until 31 december 1993 inclusively, and his year of birth is 1994 if he was born from 1 January 1994 to 24 September 1994.

Other examples:

If now 9 years, year of birth 2013 or 2014
If now 16 years, year of birth 2006 or 2007
If now 19 years, year of birth 2003 or 2004
If now 37 years, year of birth 1985 or 1986

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