102 years old now in 2023 - what year born?


Today, 31 January 2023 if a person is 102 years old now, what year was he born? See below:


If 102 years old, year of birth is:
1920 or 1921*
*It depends on whether he was born before or after 1 January 1921.


If now 102 years and his year of birth 1920 if he was born after 31 January 1920 until 31 december 1920 inclusively, and his year of birth is 1921 if he was born from 1 January 1921 to 31 January 1921.


Other examples:

If now 6 years, year of birth 2016 or 2017
If now 14 years, year of birth 2008 or 2009
If now 29 years, year of birth 1993 or 1994
If now 33 years, year of birth 1989 or 1990

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