20 years old now in 2022 - what year born?


Today, 7 July 2022 if a person is 20 years old now, what year was he born? See below:


If 20 years old, year of birth is:
2001 or 2002*
*It depends on whether he was born before or after 1 January 2002.


If now 20 years and his year of birth 2001 if he was born after 7 July 2001 until 31 december 2001 inclusively, and his year of birth is 2002 if he was born from 1 January 2002 to 7 July 2002.


Other examples:

If now 6 years, year of birth 2015 or 2016
If now 15 years, year of birth 2006 or 2007
If now 28 years, year of birth 1993 or 1994
If now 40 years, year of birth 1981 or 1982

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