70 years old now in 2021 - what year born?


Today, 21 January 2021 if a person is 70 years old now, what year was he born? See below:


If 70 years old, year of birth is:
1950 or 1951*
*It depends on whether he was born before or after 1 January 1951.


If now 70 years and his year of birth 1950 if he was born after 21 January 1950 until 31 december 1950 inclusively, and his year of birth is 1951 if he was born from 1 January 1951 to 21 January 1951.


Other examples:

If now 6 years, year of birth 2014 or 2015
If now 14 years, year of birth 2006 or 2007
If now 23 years, year of birth 1997 or 1998
If now 55 years, year of birth 1965 or 1966

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