1 years old now in 2021 - what year born?


Today, 23 October 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 23 October 2019 until 31 december 2019 inclusively, and his year of birth is 2020 if he was born from 1 January 2020 to 23 October 2020.


Other examples:

If now 7 years, year of birth 2013 or 2014
If now 16 years, year of birth 2004 or 2005
If now 24 years, year of birth 1996 or 1997
If now 66 years, year of birth 1954 or 1955

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