90 years old now in 2024 - what year born?

Today, 14 October 2024 if a person is 90 years old now, what year was he born? See below:

If 90 years old, year of birth is:
1933 or 1934*

*It depends on whether he was born before or after 1 January 1934.

If now 90 years and his year of birth 1933 if he was born after 14 October 1933 until 31 december 1933 inclusively, and his year of birth is 1934 if he was born from 1 January 1934 to 14 October 1934.

Other examples:

If now 12 years, year of birth 2011 or 2012
If now 12 years, year of birth 2011 or 2012
If now 30 years, year of birth 1993 or 1994
If now 100 years, year of birth 1923 or 1924

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