12 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 12 years old now, what year was he born? See below:

If 12 years old, year of birth is:
2013 or 2014*

*It depends on whether he was born before or after 1 January 2014.

If now 12 years and his year of birth 2013 if he was born after 28 October 2013 until 31 december 2013 inclusively, and his year of birth is 2014 if he was born from 1 January 2014 to 28 October 2014.

Other examples:

If now 7 years, year of birth 2018 or 2019
If now 15 years, year of birth 2010 or 2011
If now 30 years, year of birth 1995 or 1996
If now 99 years, year of birth 1926 or 1927

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