51 years old now in 2021 - what year born?


Today, 26 January 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 26 January 1969 until 31 december 1969 inclusively, and his year of birth is 1970 if he was born from 1 January 1970 to 26 January 1970.


Other examples:

If now 3 years, year of birth 2017 or 2018
If now 15 years, year of birth 2005 or 2006
If now 22 years, year of birth 1998 or 1999
If now 34 years, year of birth 1986 or 1987

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