101 years old now in 2023 - what year born?

Today, 30 November 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 30 November 1921 until 31 december 1921 inclusively, and his year of birth is 1922 if he was born from 1 January 1922 to 30 November 1922.

Other examples:

If now 11 years, year of birth 2011 or 2012
If now 15 years, year of birth 2007 or 2008
If now 29 years, year of birth 1993 or 1994
If now 48 years, year of birth 1974 or 1975

HTML code:

BB code: