101 years old now in 2023 - what year born?


Today, 1 February 2023 if a person is 101 years old now, what year was he born? See below:


If 101 years old, year of birth is:
1921 or 1922*
*It depends on whether he was born before or after 1 January 1922.


If now 101 years and his year of birth 1921 if he was born after 1 February 1921 until 31 december 1921 inclusively, and his year of birth is 1922 if he was born from 1 January 1922 to 1 February 1922.


Other examples:

If now 12 years, year of birth 2010 or 2011
If now 13 years, year of birth 2009 or 2010
If now 23 years, year of birth 1999 or 2000
If now 72 years, year of birth 1950 or 1951

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