45 years old now in 2023 - what year born?


Today, 1 February 2023 if a person is 45 years old now, what year was he born? See below:


If 45 years old, year of birth is:
1977 or 1978*
*It depends on whether he was born before or after 1 January 1978.


If now 45 years and his year of birth 1977 if he was born after 1 February 1977 until 31 december 1977 inclusively, and his year of birth is 1978 if he was born from 1 January 1978 to 1 February 1978.


Other examples:

If now 3 years, year of birth 2019 or 2020
If now 16 years, year of birth 2006 or 2007
If now 18 years, year of birth 2004 or 2005
If now 42 years, year of birth 1980 or 1981

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