51 years old now in 2022 - what year born?


Today, 7 June 2022 if a person is 51 years old now, what year was he born? See below:


If 51 years old, year of birth is:
1970 or 1971*
*It depends on whether he was born before or after 1 January 1971.


If now 51 years and his year of birth 1970 if he was born after 7 June 1970 until 31 december 1970 inclusively, and his year of birth is 1971 if he was born from 1 January 1971 to 7 June 1971.


Other examples:

If now 4 years, year of birth 2017 or 2018
If now 13 years, year of birth 2008 or 2009
If now 30 years, year of birth 1991 or 1992
If now 61 years, year of birth 1960 or 1961

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