13 years old now in 2023 - what year born?


Today, 31 January 2023 if a person is 13 years old now, what year was he born? See below:


If 13 years old, year of birth is:
2009 or 2010*
*It depends on whether he was born before or after 1 January 2010.


If now 13 years and his year of birth 2009 if he was born after 31 January 2009 until 31 december 2009 inclusively, and his year of birth is 2010 if he was born from 1 January 2010 to 31 January 2010.


Other examples:

If now 4 years, year of birth 2018 or 2019
If now 16 years, year of birth 2006 or 2007
If now 20 years, year of birth 2002 or 2003
If now 45 years, year of birth 1977 or 1978

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