25 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 25 years old now, what year was he born? See below:

If 25 years old, year of birth is:
1999 or 2000*

*It depends on whether he was born before or after 1 January 2000.

If now 25 years and his year of birth 1999 if he was born after 19 December 1999 until 31 december 1999 inclusively, and his year of birth is 2000 if he was born from 1 January 2000 to 19 December 2000.

Other examples:

If now 5 years, year of birth 2019 or 2020
If now 14 years, year of birth 2010 or 2011
If now 23 years, year of birth 2001 or 2002
If now 35 years, year of birth 1989 or 1990

HTML code:

BB code: