121 years old now in 2025 - what year born?


Today, 17 February 2025 if a person is 121 years old now, what year was he born? See below:


If 121 years old, year of birth is:
1903 or 1904*
*It depends on whether he was born before or after 1 January 1904.


If now 121 years and his year of birth 1903 if he was born after 17 February 1903 until 31 december 1903 inclusively, and his year of birth is 1904 if he was born from 1 January 1904 to 17 February 1904.


Other examples:

If now 4 years, year of birth 2020 or 2021
If now 15 years, year of birth 2009 or 2010
If now 22 years, year of birth 2002 or 2003
If now 90 years, year of birth 1934 or 1935

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