77 years old now in 2023 - what year born?

Today, 23 September 2023 if a person is 77 years old now, what year was he born? See below:

If 77 years old, year of birth is:
1945 or 1946*

*It depends on whether he was born before or after 1 January 1946.

If now 77 years and his year of birth 1945 if he was born after 23 September 1945 until 31 december 1945 inclusively, and his year of birth is 1946 if he was born from 1 January 1946 to 23 September 1946.

Other examples:

If now 9 years, year of birth 2013 or 2014
If now 16 years, year of birth 2006 or 2007
If now 18 years, year of birth 2004 or 2005
If now 85 years, year of birth 1937 or 1938

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