25 years old now in 2023 - what year born?


Today, 31 January 2023 if a person is 25 years old now, what year was he born? See below:


If 25 years old, year of birth is:
1997 or 1998*
*It depends on whether he was born before or after 1 January 1998.


If now 25 years and his year of birth 1997 if he was born after 31 January 1997 until 31 december 1997 inclusively, and his year of birth is 1998 if he was born from 1 January 1998 to 31 January 1998.


Other examples:

If now 11 years, year of birth 2011 or 2012
If now 12 years, year of birth 2010 or 2011
If now 22 years, year of birth 2000 or 2001
If now 55 years, year of birth 1967 or 1968

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