88 years old now in 2023 - what year born?

Today, 30 November 2023 if a person is 88 years old now, what year was he born? See below:

If 88 years old, year of birth is:
1934 or 1935*

*It depends on whether he was born before or after 1 January 1935.

If now 88 years and his year of birth 1934 if he was born after 30 November 1934 until 31 december 1934 inclusively, and his year of birth is 1935 if he was born from 1 January 1935 to 30 November 1935.

Other examples:

If now 11 years, year of birth 2011 or 2012
If now 17 years, year of birth 2005 or 2006
If now 21 years, year of birth 2001 or 2002
If now 66 years, year of birth 1956 or 1957

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