51 years old now in 2022 - what year born?


Today, 8 December 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 8 December 1970 until 31 december 1970 inclusively, and his year of birth is 1971 if he was born from 1 January 1971 to 8 December 1971.


Other examples:

If now 3 years, year of birth 2018 or 2019
If now 12 years, year of birth 2009 or 2010
If now 20 years, year of birth 2001 or 2002
If now 67 years, year of birth 1954 or 1955

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