77 years old now in 2023 - what year born?

Today, 26 March 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 26 March 1945 until 31 december 1945 inclusively, and his year of birth is 1946 if he was born from 1 January 1946 to 26 March 1946.

Other examples:

If now 9 years, year of birth 2013 or 2014
If now 12 years, year of birth 2010 or 2011
If now 21 years, year of birth 2001 or 2002
If now 56 years, year of birth 1966 or 1967

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