51 years old now in 2021 - what year born?


Today, 14 September 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 14 September 1969 until 31 december 1969 inclusively, and his year of birth is 1970 if he was born from 1 January 1970 to 14 September 1970.


Other examples:

If now 11 years, year of birth 2009 or 2010
If now 14 years, year of birth 2006 or 2007
If now 23 years, year of birth 1997 or 1998
If now 97 years, year of birth 1923 or 1924

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