67 years old now in 2023 - what year born?

Today, 23 September 2023 if a person is 67 years old now, what year was he born? See below:

If 67 years old, year of birth is:
1955 or 1956*

*It depends on whether he was born before or after 1 January 1956.

If now 67 years and his year of birth 1955 if he was born after 23 September 1955 until 31 december 1955 inclusively, and his year of birth is 1956 if he was born from 1 January 1956 to 23 September 1956.

Other examples:

If now 10 years, year of birth 2012 or 2013
If now 18 years, year of birth 2004 or 2005
If now 27 years, year of birth 1995 or 1996
If now 66 years, year of birth 1956 or 1957

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