36 years old now in 2025 - what year born?

Today, 23 January 2025 if a person is 36 years old now, what year was he born? See below:

If 36 years old, year of birth is:
1988 or 1989*

*It depends on whether he was born before or after 1 January 1989.

If now 36 years and his year of birth 1988 if he was born after 23 January 1988 until 31 december 1988 inclusively, and his year of birth is 1989 if he was born from 1 January 1989 to 23 January 1989.

Other examples:

If now 3 years, year of birth 2021 or 2022
If now 17 years, year of birth 2007 or 2008
If now 18 years, year of birth 2006 or 2007
If now 81 years, year of birth 1943 or 1944

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