135 years old now in 2023 - what year born?

Today, 24 September 2023 if a person is 135 years old now, what year was he born? See below:

If 135 years old, year of birth is:
1887 or 1888*

*It depends on whether he was born before or after 1 January 1888.

If now 135 years and his year of birth 1887 if he was born after 24 September 1887 until 31 december 1887 inclusively, and his year of birth is 1888 if he was born from 1 January 1888 to 24 September 1888.

Other examples:

If now 6 years, year of birth 2016 or 2017
If now 15 years, year of birth 2007 or 2008
If now 25 years, year of birth 1997 or 1998
If now 61 years, year of birth 1961 or 1962

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