In the thread on retirement communities with masters clubs, @pwb mentioned Saddlebrooke. While looking at their site, something wacky occurred to me. I thought I would throw it out there before reason got the better of me.
Maybe USMS should give an annual award to the club with the greatest average age of the swimmers who competed during the year. I think you could easily compute the average age by (for each club/workout group/LMSC, whatever) summing the swimmers' ages for each splash, then dividing by the total number of splashes by that club. If you wanted to get all fancy about it, you could probably factor in the distance of the swims as well, so that (for example) a 1650 swum by an 89yo would count more than a 200 by a 45yo. You could also include Postal Swims in consideration of the award, not just regular swim meets.
