50 years old now in 2021 - what year born?


Today, 28 January 2021 if a person is 50 years old now, what year was he born? See below:


If 50 years old, year of birth is:
1970 or 1971*
*It depends on whether he was born before or after 1 January 1971.


If now 50 years and his year of birth 1970 if he was born after 28 January 1970 until 31 december 1970 inclusively, and his year of birth is 1971 if he was born from 1 January 1971 to 28 January 1971.


Other examples:

If now 9 years, year of birth 2011 or 2012
If now 18 years, year of birth 2002 or 2003
If now 27 years, year of birth 1993 or 1994
If now 51 years, year of birth 1969 or 1970

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