150 years old now in 2021 - what year born?


Today, 28 December 2021 if a person is 150 years old now, what year was he born? See below:


If 150 years old, year of birth is:
1870 or 1871*
*It depends on whether he was born before or after 1 January 1871.


If now 150 years and his year of birth 1870 if he was born after 28 December 1870 until 31 december 1870 inclusively, and his year of birth is 1871 if he was born from 1 January 1871 to 28 December 1871.


Other examples:

If now 6 years, year of birth 2014 or 2015
If now 18 years, year of birth 2002 or 2003
If now 24 years, year of birth 1996 or 1997
If now 39 years, year of birth 1981 or 1982

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