100 years old now in 2022 - what year born?


Today, 12 June 2022 if a person is 100 years old now, what year was he born? See below:


If 100 years old, year of birth is:
1921 or 1922*
*It depends on whether he was born before or after 1 January 1922.


If now 100 years and his year of birth 1921 if he was born after 12 June 1921 until 31 december 1921 inclusively, and his year of birth is 1922 if he was born from 1 January 1922 to 12 June 1922.


Other examples:

If now 3 years, year of birth 2018 or 2019
If now 16 years, year of birth 2005 or 2006
If now 26 years, year of birth 1995 or 1996
If now 99 years, year of birth 1922 or 1923

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