83 years old now in 2021 - what year born?


Today, 18 January 2021 if a person is 83 years old now, what year was he born? See below:


If 83 years old, year of birth is:
1937 or 1938*
*It depends on whether he was born before or after 1 January 1938.


If now 83 years and his year of birth 1937 if he was born after 18 January 1937 until 31 december 1937 inclusively, and his year of birth is 1938 if he was born from 1 January 1938 to 18 January 1938.


Other examples:

If now 10 years, year of birth 2010 or 2011
If now 12 years, year of birth 2008 or 2009
If now 20 years, year of birth 2000 or 2001
If now 89 years, year of birth 1931 or 1932

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