I've been old in a class and had a high last four in another. I would say the least discriminatory method is just to draw a name from a hat. No one does that. My most recent class I was 5 of 14 and after 10 years I'm #1 of 2 remaining. My point is it changes and it is only among 10-12 guys so in the grand scheme of things it may not matter as much as we worry about.