48 years old now in 2021 - what year born?


Today, 23 January 2021 if a person is 48 years old now, what year was he born? See below:


If 48 years old, year of birth is:
1972 or 1973*
*It depends on whether he was born before or after 1 January 1973.


If now 48 years and his year of birth 1972 if he was born after 23 January 1972 until 31 december 1972 inclusively, and his year of birth is 1973 if he was born from 1 January 1973 to 23 January 1973.


Other examples:

If now 3 years, year of birth 2017 or 2018
If now 13 years, year of birth 2007 or 2008
If now 30 years, year of birth 1990 or 1991
If now 70 years, year of birth 1950 or 1951

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