1 years old now in 2021 - what year born?


Today, 26 January 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 26 January 2019 until 31 december 2019 inclusively, and his year of birth is 2020 if he was born from 1 January 2020 to 26 January 2020.


Other examples:

If now 10 years, year of birth 2010 or 2011
If now 12 years, year of birth 2008 or 2009
If now 24 years, year of birth 1996 or 1997
If now 46 years, year of birth 1974 or 1975

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