54 years old now in 2020 - what year born?


Today, 24 September 2020 if a person is 54 years old now, what year was he born? See below:


If 54 years old, year of birth is:
1965 or 1966*
*It depends on whether he was born before or after 1 January 1966.


If now 54 years and his year of birth 1965 if he was born after 24 September 1965 until 31 december 1965 inclusively, and his year of birth is 1966 if he was born from 1 January 1966 to 24 September 1966.


Other examples:

If now 4 years, year of birth 2015 or 2016
If now 17 years, year of birth 2002 or 2003
If now 18 years, year of birth 2001 or 2002
If now 64 years, year of birth 1955 or 1956

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