3 years old now in 2021 - what year born?


Today, 1 August 2021 if a person is 3 years old now, what year was he born? See below:


If 3 years old, year of birth is:
2017 or 2018*
*It depends on whether he was born before or after 1 January 2018.


If now 3 years and his year of birth 2017 if he was born after 1 August 2017 until 31 december 2017 inclusively, and his year of birth is 2018 if he was born from 1 January 2018 to 1 August 2018.


Other examples:

If now 3 years, year of birth 2017 or 2018
If now 17 years, year of birth 2003 or 2004
If now 19 years, year of birth 2001 or 2002
If now 36 years, year of birth 1984 or 1985

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