45 years old now in 2021 - what year born?


Today, 18 January 2021 if a person is 45 years old now, what year was he born? See below:


If 45 years old, year of birth is:
1975 or 1976*
*It depends on whether he was born before or after 1 January 1976.


If now 45 years and his year of birth 1975 if he was born after 18 January 1975 until 31 december 1975 inclusively, and his year of birth is 1976 if he was born from 1 January 1976 to 18 January 1976.


Other examples:

If now 11 years, year of birth 2009 or 2010
If now 18 years, year of birth 2002 or 2003
If now 20 years, year of birth 2000 or 2001
If now 85 years, year of birth 1935 or 1936

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