108 years old now in 2021 - what year born?


Today, 9 October 2021 if a person is 108 years old now, what year was he born? See below:


If 108 years old, year of birth is:
1912 or 1913*
*It depends on whether he was born before or after 1 January 1913.


If now 108 years and his year of birth 1912 if he was born after 9 October 1912 until 31 december 1912 inclusively, and his year of birth is 1913 if he was born from 1 January 1913 to 9 October 1913.


Other examples:

If now 3 years, year of birth 2017 or 2018
If now 12 years, year of birth 2008 or 2009
If now 28 years, year of birth 1992 or 1993
If now 62 years, year of birth 1958 or 1959

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