54 years old now in 2021 - what year born?


Today, 16 May 2021 if a person is 54 years old now, what year was he born? See below:


If 54 years old, year of birth is:
1966 or 1967*
*It depends on whether he was born before or after 1 January 1967.


If now 54 years and his year of birth 1966 if he was born after 16 May 1966 until 31 december 1966 inclusively, and his year of birth is 1967 if he was born from 1 January 1967 to 16 May 1967.


Other examples:

If now 7 years, year of birth 2013 or 2014
If now 12 years, year of birth 2008 or 2009
If now 27 years, year of birth 1993 or 1994
If now 91 years, year of birth 1929 or 1930

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