56 years old now in 2023 - what year born?

Today, 26 September 2023 if a person is 56 years old now, what year was he born? See below:

If 56 years old, year of birth is:
1966 or 1967*

*It depends on whether he was born before or after 1 January 1967.

If now 56 years and his year of birth 1966 if he was born after 26 September 1966 until 31 december 1966 inclusively, and his year of birth is 1967 if he was born from 1 January 1967 to 26 September 1967.

Other examples:

If now 11 years, year of birth 2011 or 2012
If now 17 years, year of birth 2005 or 2006
If now 23 years, year of birth 1999 or 2000
If now 48 years, year of birth 1974 or 1975

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