35 years old now in 2022 - what year born?

Today, 5 December 2022 if a person is 35 years old now, what year was he born? See below:

If 35 years old, year of birth is:
1986 or 1987*

*It depends on whether he was born before or after 1 January 1987.

If now 35 years and his year of birth 1986 if he was born after 5 December 1986 until 31 december 1986 inclusively, and his year of birth is 1987 if he was born from 1 January 1987 to 5 December 1987.

Other examples:

If now 3 years, year of birth 2018 or 2019
If now 18 years, year of birth 2003 or 2004
If now 18 years, year of birth 2003 or 2004
If now 89 years, year of birth 1932 or 1933

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