In my experience, the older a guy is the less active he is due to other obligations. IMO once you get over 21/22 the person fits in less. Granted if the person is military then that doesn't tend to be an issue, but all others fit into the mold of being less active.
Unless the school is really nontraditional, I couldn't imagine having anyone over 22 pledging that wasn't in the military. I think at mixers a 28 year old would be a burden. I can just picture a 28 year old new pledge trying to score with some 18 year old sorority pledge. (Doing the math he was 20 when most of the girls were 10-13. Gross)
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