13 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 13 years old now, what year was he born? See below:

If 13 years old, year of birth is:
2012 or 2013*

*It depends on whether he was born before or after 1 January 2013.

If now 13 years and his year of birth 2012 if he was born after 28 October 2012 until 31 december 2012 inclusively, and his year of birth is 2013 if he was born from 1 January 2013 to 28 October 2013.

Other examples:

If now 6 years, year of birth 2019 or 2020
If now 16 years, year of birth 2009 or 2010
If now 23 years, year of birth 2002 or 2003
If now 63 years, year of birth 1962 or 1963

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