Why Did So Many People Never Get Married in Shakespeare's Day?

Men and women did not marry in elizabethan times until they were, on the average, 25 years old. Even if you were an aristocrat, there weren't a lot of balls to attend. Romeo and juliet are tean agers. Why would count de paris want to marry a rich guy's daughter? As the nurse says, who gets juliet's cana have the chinks?"