90 years old now in 2023 - what year born?

Today, 27 March 2023 if a person is 90 years old now, what year was he born? See below:

If 90 years old, year of birth is:
1932 or 1933*

*It depends on whether he was born before or after 1 January 1933.

If now 90 years and his year of birth 1932 if he was born after 27 March 1932 until 31 december 1932 inclusively, and his year of birth is 1933 if he was born from 1 January 1933 to 27 March 1933.

Other examples:

If now 5 years, year of birth 2017 or 2018
If now 14 years, year of birth 2008 or 2009
If now 27 years, year of birth 1995 or 1996
If now 87 years, year of birth 1935 or 1936

HTML code:

BB code: