10 years old now in 2024 - what year born?

Today, 10 October 2024 if a person is 10 years old now, what year was he born? See below:

If 10 years old, year of birth is:
2013 or 2014*

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

If now 10 years and his year of birth 2013 if he was born after 10 October 2013 until 31 december 2013 inclusively, and his year of birth is 2014 if he was born from 1 January 2014 to 10 October 2014.

Other examples:

If now 12 years, year of birth 2011 or 2012
If now 18 years, year of birth 2005 or 2006
If now 30 years, year of birth 1993 or 1994
If now 51 years, year of birth 1972 or 1973

HTML code:

BB code: