115 years old now in 2021 - what year born?


Today, 8 March 2021 if a person is 115 years old now, what year was he born? See below:


If 115 years old, year of birth is:
1905 or 1906*
*It depends on whether he was born before or after 1 January 1906.


If now 115 years and his year of birth 1905 if he was born after 8 March 1905 until 31 december 1905 inclusively, and his year of birth is 1906 if he was born from 1 January 1906 to 8 March 1906.


Other examples:

If now 3 years, year of birth 2017 or 2018
If now 17 years, year of birth 2003 or 2004
If now 18 years, year of birth 2002 or 2003
If now 88 years, year of birth 1932 or 1933

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