76 years old now in 2023 - what year born?

Today, 30 November 2023 if a person is 76 years old now, what year was he born? See below:

If 76 years old, year of birth is:
1946 or 1947*

*It depends on whether he was born before or after 1 January 1947.

If now 76 years and his year of birth 1946 if he was born after 30 November 1946 until 31 december 1946 inclusively, and his year of birth is 1947 if he was born from 1 January 1947 to 30 November 1947.

Other examples:

If now 7 years, year of birth 2015 or 2016
If now 18 years, year of birth 2004 or 2005
If now 19 years, year of birth 2003 or 2004
If now 48 years, year of birth 1974 or 1975

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