100 years old now in 2022 - what year born?


Today, 19 January 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 19 January 1921 until 31 december 1921 inclusively, and his year of birth is 1922 if he was born from 1 January 1922 to 19 January 1922.


Other examples:

If now 5 years, year of birth 2016 or 2017
If now 18 years, year of birth 2003 or 2004
If now 29 years, year of birth 1992 or 1993
If now 37 years, year of birth 1984 or 1985

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