31 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 31 years old now, what year was he born? See below:

If 31 years old, year of birth is:
1993 or 1994*

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

If now 31 years and his year of birth 1993 if he was born after 19 December 1993 until 31 december 1993 inclusively, and his year of birth is 1994 if he was born from 1 January 1994 to 19 December 1994.

Other examples:

If now 11 years, year of birth 2013 or 2014
If now 14 years, year of birth 2010 or 2011
If now 24 years, year of birth 2000 or 2001
If now 47 years, year of birth 1977 or 1978

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