49 years old now in 2021 - what year born?


Today, 21 September 2021 if a person is 49 years old now, what year was he born? See below:


If 49 years old, year of birth is:
1971 or 1972*
*It depends on whether he was born before or after 1 January 1972.


If now 49 years and his year of birth 1971 if he was born after 21 September 1971 until 31 december 1971 inclusively, and his year of birth is 1972 if he was born from 1 January 1972 to 21 September 1972.


Other examples:

If now 11 years, year of birth 2009 or 2010
If now 12 years, year of birth 2008 or 2009
If now 21 years, year of birth 1999 or 2000
If now 48 years, year of birth 1972 or 1973

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