100 years old now in 2024 - what year born?


Today, 15 April 2024 if a person is 100 years old now, what year was he born? See below:


If 100 years old, year of birth is:
1923 or 1924*
*It depends on whether he was born before or after 1 January 1924.


If now 100 years and his year of birth 1923 if he was born after 15 April 1923 until 31 december 1923 inclusively, and his year of birth is 1924 if he was born from 1 January 1924 to 15 April 1924.


Other examples:

If now 7 years, year of birth 2016 or 2017
If now 17 years, year of birth 2006 or 2007
If now 23 years, year of birth 2000 or 2001
If now 70 years, year of birth 1953 or 1954

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