20 years old now in 2022 - what year born?


Today, 21 January 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 21 January 2001 until 31 december 2001 inclusively, and his year of birth is 2002 if he was born from 1 January 2002 to 21 January 2002.


Other examples:

If now 4 years, year of birth 2017 or 2018
If now 13 years, year of birth 2008 or 2009
If now 29 years, year of birth 1992 or 1993
If now 80 years, year of birth 1941 or 1942

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