35 years old now in 2023 - what year born?

Today, 24 September 2023 if a person is 35 years old now, what year was he born? See below:

If 35 years old, year of birth is:
1987 or 1988*

*It depends on whether he was born before or after 1 January 1988.

If now 35 years and his year of birth 1987 if he was born after 24 September 1987 until 31 december 1987 inclusively, and his year of birth is 1988 if he was born from 1 January 1988 to 24 September 1988.

Other examples:

If now 12 years, year of birth 2010 or 2011
If now 16 years, year of birth 2006 or 2007
If now 18 years, year of birth 2004 or 2005
If now 88 years, year of birth 1934 or 1935

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