1 years old now in 2020 - what year born?


Today, 27 October 2020 if a person is 1 years old now, what year was he born? See below:


If 1 years old, year of birth is:
2018 or 2019*
*It depends on whether he was born before or after 1 January 2019.


If now 1 years and his year of birth 2018 if he was born after 27 October 2018 until 31 december 2018 inclusively, and his year of birth is 2019 if he was born from 1 January 2019 to 27 October 2019.


Other examples:

If now 8 years, year of birth 2011 or 2012
If now 13 years, year of birth 2006 or 2007
If now 18 years, year of birth 2001 or 2002
If now 35 years, year of birth 1984 or 1985

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