31 years old now in 2024 - what year born?

Today, 10 October 2024 if a person is 31 years old now, what year was he born? See below:

If 31 years old, year of birth is:
1992 or 1993*

*It depends on whether he was born before or after 1 January 1993.

If now 31 years and his year of birth 1992 if he was born after 10 October 1992 until 31 december 1992 inclusively, and his year of birth is 1993 if he was born from 1 January 1993 to 10 October 1993.

Other examples:

If now 12 years, year of birth 2011 or 2012
If now 14 years, year of birth 2009 or 2010
If now 29 years, year of birth 1994 or 1995
If now 32 years, year of birth 1991 or 1992

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