135 years old now in 2021 - what year born?


Today, 28 January 2021 if a person is 135 years old now, what year was he born? See below:


If 135 years old, year of birth is:
1885 or 1886*
*It depends on whether he was born before or after 1 January 1886.


If now 135 years and his year of birth 1885 if he was born after 28 January 1885 until 31 december 1885 inclusively, and his year of birth is 1886 if he was born from 1 January 1886 to 28 January 1886.


Other examples:

If now 9 years, year of birth 2011 or 2012
If now 16 years, year of birth 2004 or 2005
If now 20 years, year of birth 2000 or 2001
If now 56 years, year of birth 1964 or 1965

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