36 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 36 years old now, what year was he born? See below:

If 36 years old, year of birth is:
1989 or 1990*

*It depends on whether he was born before or after 1 January 1990.

If now 36 years and his year of birth 1989 if he was born after 28 October 1989 until 31 december 1989 inclusively, and his year of birth is 1990 if he was born from 1 January 1990 to 28 October 1990.

Other examples:

If now 8 years, year of birth 2017 or 2018
If now 16 years, year of birth 2009 or 2010
If now 28 years, year of birth 1997 or 1998
If now 81 years, year of birth 1944 or 1945

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