20 years old now in 2021 - what year born?


Today, 15 April 2021 if a person is 20 years old now, what year was he born? See below:


If 20 years old, year of birth is:
2000 or 2001*
*It depends on whether he was born before or after 1 January 2001.


If now 20 years and his year of birth 2000 if he was born after 15 April 2000 until 31 december 2000 inclusively, and his year of birth is 2001 if he was born from 1 January 2001 to 15 April 2001.


Other examples:

If now 3 years, year of birth 2017 or 2018
If now 15 years, year of birth 2005 or 2006
If now 22 years, year of birth 1998 or 1999
If now 54 years, year of birth 1966 or 1967

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