1 years old now in 2021 - what year born?


Today, 24 July 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 24 July 2019 until 31 december 2019 inclusively, and his year of birth is 2020 if he was born from 1 January 2020 to 24 July 2020.


Other examples:

If now 3 years, year of birth 2017 or 2018
If now 18 years, year of birth 2002 or 2003
If now 21 years, year of birth 1999 or 2000
If now 79 years, year of birth 1941 or 1942

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