45 years old now in 2020 - what year born?


Today, 19 October 2020 if a person is 45 years old now, what year was he born? See below:


If 45 years old, year of birth is:
1974 or 1975*
*It depends on whether he was born before or after 1 January 1975.


If now 45 years and his year of birth 1974 if he was born after 19 October 1974 until 31 december 1974 inclusively, and his year of birth is 1975 if he was born from 1 January 1975 to 19 October 1975.


Other examples:

If now 12 years, year of birth 2007 or 2008
If now 15 years, year of birth 2004 or 2005
If now 19 years, year of birth 2000 or 2001
If now 57 years, year of birth 1962 or 1963

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