109 years old now in 2023 - what year born?


Today, 31 January 2023 if a person is 109 years old now, what year was he born? See below:


If 109 years old, year of birth is:
1913 or 1914*
*It depends on whether he was born before or after 1 January 1914.


If now 109 years and his year of birth 1913 if he was born after 31 January 1913 until 31 december 1913 inclusively, and his year of birth is 1914 if he was born from 1 January 1914 to 31 January 1914.


Other examples:

If now 5 years, year of birth 2017 or 2018
If now 18 years, year of birth 2004 or 2005
If now 27 years, year of birth 1995 or 1996
If now 48 years, year of birth 1974 or 1975

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