1 years old now in 2021 - what year born?


Today, 15 April 2021 if a person is 1 years old now, what year was he born? See below:


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


If now 1 years and his year of birth 2019 if he was born after 15 April 2019 until 31 december 2019 inclusively, and his year of birth is 2020 if he was born from 1 January 2020 to 15 April 2020.


Other examples:

If now 4 years, year of birth 2016 or 2017
If now 13 years, year of birth 2007 or 2008
If now 23 years, year of birth 1997 or 1998
If now 84 years, year of birth 1936 or 1937

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