2 years old now in 2020 - what year born?


Today, 21 September 2020 if a person is 2 years old now, what year was he born? See below:


If 2 years old, year of birth is:
2017 or 2018*
*It depends on whether he was born before or after 1 January 2018.


If now 2 years and his year of birth 2017 if he was born after 21 September 2017 until 31 december 2017 inclusively, and his year of birth is 2018 if he was born from 1 January 2018 to 21 September 2018.


Other examples:

If now 9 years, year of birth 2010 or 2011
If now 15 years, year of birth 2004 or 2005
If now 30 years, year of birth 1989 or 1990
If now 41 years, year of birth 1978 or 1979

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