30 years old now in 2024 - what year born?

Today, 15 October 2024 if a person is 30 years old now, what year was he born? See below:

If 30 years old, year of birth is:
1993 or 1994*

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

If now 30 years and his year of birth 1993 if he was born after 15 October 1993 until 31 december 1993 inclusively, and his year of birth is 1994 if he was born from 1 January 1994 to 15 October 1994.

Other examples:

If now 9 years, year of birth 2014 or 2015
If now 14 years, year of birth 2009 or 2010
If now 28 years, year of birth 1995 or 1996
If now 32 years, year of birth 1991 or 1992

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