68 years old now in 2023 - what year born?

Today, 30 November 2023 if a person is 68 years old now, what year was he born? See below:

If 68 years old, year of birth is:
1954 or 1955*

*It depends on whether he was born before or after 1 January 1955.

If now 68 years and his year of birth 1954 if he was born after 30 November 1954 until 31 december 1954 inclusively, and his year of birth is 1955 if he was born from 1 January 1955 to 30 November 1955.

Other examples:

If now 11 years, year of birth 2011 or 2012
If now 18 years, year of birth 2004 or 2005
If now 20 years, year of birth 2002 or 2003
If now 58 years, year of birth 1964 or 1965

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