88 years old now in 2023 - what year born?

Today, 1 February 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 1 February 1934 until 31 december 1934 inclusively, and his year of birth is 1935 if he was born from 1 January 1935 to 1 February 1935.

Other examples:

If now 5 years, year of birth 2017 or 2018
If now 15 years, year of birth 2007 or 2008
If now 26 years, year of birth 1996 or 1997
If now 57 years, year of birth 1965 or 1966

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