150 years old now in 2021 - what year born?


Today, 7 May 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 7 May 1870 until 31 december 1870 inclusively, and his year of birth is 1871 if he was born from 1 January 1871 to 7 May 1871.


Other examples:

If now 10 years, year of birth 2010 or 2011
If now 17 years, year of birth 2003 or 2004
If now 27 years, year of birth 1993 or 1994
If now 49 years, year of birth 1971 or 1972

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