150 years old now in 2021 - what year born?


Today, 11 September 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 11 September 1870 until 31 december 1870 inclusively, and his year of birth is 1871 if he was born from 1 January 1871 to 11 September 1871.


Other examples:

If now 3 years, year of birth 2017 or 2018
If now 16 years, year of birth 2004 or 2005
If now 23 years, year of birth 1997 or 1998
If now 87 years, year of birth 1933 or 1934

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