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There are 31 days in May.
Before May 31 you were 21.
Starting May 31 you were 22.
92. There are 31 in May, plus 30 in June, plus 31 in July. So 31 + 30 + 31 = 92 days.
May 31, 1932 was a Tuesday.
May 31, 1959 was a Sunday.