25 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 25 years old now, what year was he born? See below:

If 25 years old, year of birth is:
2000 or 2001*

*It depends on whether he was born before or after 1 January 2001.

If now 25 years and his year of birth 2000 if he was born after 28 October 2000 until 31 december 2000 inclusively, and his year of birth is 2001 if he was born from 1 January 2001 to 28 October 2001.

Other examples:

If now 7 years, year of birth 2018 or 2019
If now 18 years, year of birth 2007 or 2008
If now 26 years, year of birth 1999 or 2000
If now 60 years, year of birth 1965 or 1966

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