4 years old now in 2024 - what year born?


Today, 29 February 2024 if a person is 4 years old now, what year was he born? See below:


If 4 years old, year of birth is:
2019 or 2020*
*It depends on whether he was born before or after 1 January 2020.


If now 4 years and his year of birth 2019 if he was born after 29 February 2019 until 31 december 2019 inclusively, and his year of birth is 2020 if he was born from 1 January 2020 to 29 February 2020.


Other examples:

If now 10 years, year of birth 2013 or 2014
If now 15 years, year of birth 2008 or 2009
If now 25 years, year of birth 1998 or 1999
If now 45 years, year of birth 1978 or 1979

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