79 years old now in 2024 - what year born?

Today, 4 December 2024 if a person is 79 years old now, what year was he born? See below:

If 79 years old, year of birth is:
1944 or 1945*

*It depends on whether he was born before or after 1 January 1945.

If now 79 years and his year of birth 1944 if he was born after 4 December 1944 until 31 december 1944 inclusively, and his year of birth is 1945 if he was born from 1 January 1945 to 4 December 1945.

Other examples:

If now 12 years, year of birth 2011 or 2012
If now 12 years, year of birth 2011 or 2012
If now 20 years, year of birth 2003 or 2004
If now 100 years, year of birth 1923 or 1924

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