55 years old now in 2023 - what year born?

Today, 26 September 2023 if a person is 55 years old now, what year was he born? See below:

If 55 years old, year of birth is:
1967 or 1968*

*It depends on whether he was born before or after 1 January 1968.

If now 55 years and his year of birth 1967 if he was born after 26 September 1967 until 31 december 1967 inclusively, and his year of birth is 1968 if he was born from 1 January 1968 to 26 September 1968.

Other examples:

If now 8 years, year of birth 2014 or 2015
If now 13 years, year of birth 2009 or 2010
If now 22 years, year of birth 2000 or 2001
If now 88 years, year of birth 1934 or 1935

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