<p>I don't think the arithmetic average age is a good statistic to use anyway- I would think median age might be better. Problem is, the distribution of ages for college students is uneven- there are going to be a lot more people in their 30's, 40's, even 50+ going to undergraduate school than people under the age of 18. So all it takes is relatively few older folks attending a school to bring the average up. But the "face" of that school is still going to be 18-22 year olds.</p>