13 years old now in 2024 - what year born?


Today, 20 April 2024 if a person is 13 years old now, what year was he born? See below:


If 13 years old, year of birth is:
2010 or 2011*
*It depends on whether he was born before or after 1 January 2011.


If now 13 years and his year of birth 2010 if he was born after 20 April 2010 until 31 december 2010 inclusively, and his year of birth is 2011 if he was born from 1 January 2011 to 20 April 2011.


Other examples:

If now 5 years, year of birth 2018 or 2019
If now 12 years, year of birth 2011 or 2012
If now 23 years, year of birth 2000 or 2001
If now 33 years, year of birth 1990 or 1991

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