90 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 90 years old now, what year was he born? See below:

If 90 years old, year of birth is:
1935 or 1936*

*It depends on whether he was born before or after 1 January 1936.

If now 90 years and his year of birth 1935 if he was born after 28 October 1935 until 31 december 1935 inclusively, and his year of birth is 1936 if he was born from 1 January 1936 to 28 October 1936.

Other examples:

If now 7 years, year of birth 2018 or 2019
If now 15 years, year of birth 2010 or 2011
If now 18 years, year of birth 2007 or 2008
If now 51 years, year of birth 1974 or 1975

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