51 years old now in 2021 - what year born?


Today, 7 May 2021 if a person is 51 years old now, what year was he born? See below:


If 51 years old, year of birth is:
1969 or 1970*
*It depends on whether he was born before or after 1 January 1970.


If now 51 years and his year of birth 1969 if he was born after 7 May 1969 until 31 december 1969 inclusively, and his year of birth is 1970 if he was born from 1 January 1970 to 7 May 1970.


Other examples:

If now 5 years, year of birth 2015 or 2016
If now 14 years, year of birth 2006 or 2007
If now 23 years, year of birth 1997 or 1998
If now 100 years, year of birth 1920 or 1921

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