20 years old now in 2021 - what year born?


Today, 25 January 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 25 January 2000 until 31 december 2000 inclusively, and his year of birth is 2001 if he was born from 1 January 2001 to 25 January 2001.


Other examples:

If now 4 years, year of birth 2016 or 2017
If now 16 years, year of birth 2004 or 2005
If now 25 years, year of birth 1995 or 1996
If now 40 years, year of birth 1980 or 1981

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