26 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 26 years old now, what year was he born? See below:

If 26 years old, year of birth is:
1999 or 2000*

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

If now 26 years and his year of birth 1999 if he was born after 28 October 1999 until 31 december 1999 inclusively, and his year of birth is 2000 if he was born from 1 January 2000 to 28 October 2000.

Other examples:

If now 7 years, year of birth 2018 or 2019
If now 17 years, year of birth 2008 or 2009
If now 21 years, year of birth 2004 or 2005
If now 53 years, year of birth 1972 or 1973

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