15 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 15 years old now, what year was he born? See below:

If 15 years old, year of birth is:
2010 or 2011*

*It depends on whether he was born before or after 1 January 2011.

If now 15 years and his year of birth 2010 if he was born after 28 October 2010 until 31 december 2010 inclusively, and his year of birth is 2011 if he was born from 1 January 2011 to 28 October 2011.

Other examples:

If now 5 years, year of birth 2020 or 2021
If now 14 years, year of birth 2011 or 2012
If now 28 years, year of birth 1997 or 1998
If now 70 years, year of birth 1955 or 1956

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