49 years old now in 2021 - what year born?


Today, 18 January 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 18 January 1971 until 31 december 1971 inclusively, and his year of birth is 1972 if he was born from 1 January 1972 to 18 January 1972.


Other examples:

If now 11 years, year of birth 2009 or 2010
If now 15 years, year of birth 2005 or 2006
If now 22 years, year of birth 1998 or 1999
If now 66 years, year of birth 1954 or 1955

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