113 years old now in 2023 - what year born?


Today, 31 January 2023 if a person is 113 years old now, what year was he born? See below:


If 113 years old, year of birth is:
1909 or 1910*
*It depends on whether he was born before or after 1 January 1910.


If now 113 years and his year of birth 1909 if he was born after 31 January 1909 until 31 december 1909 inclusively, and his year of birth is 1910 if he was born from 1 January 1910 to 31 January 1910.


Other examples:

If now 4 years, year of birth 2018 or 2019
If now 17 years, year of birth 2005 or 2006
If now 28 years, year of birth 1994 or 1995
If now 87 years, year of birth 1935 or 1936

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