I don't think lowering the bike has anything to do with age of the rider, but more to do with form over function. If all you do is bar hop on your bagger, then lowering a bike that is already 1" lower in the rear an additional inch or more might work out, but if you actually use the bike for it's intended purpose...touring...it is not a good idea for a number of reasons. One, you are giving up a LOT of travel for the shock. Two, there can be clearance issues with the rear fender and tire. Three, instead of scraping floorboards (which give a little) you'll scrape floorboard brackets (which don't), and can lever the rear tire off the ground in a turn...not a good thing.
With shocks like the Arnott's (I have no experience with them) or the Legends (I've had two bikes with Legends) you get the best of all worlds. However, it is ill-advised to ride with them lowered all the way down...believe me, you won't want to do so, unless you like hardtail frames. With my Legends, if I'm riding where I am going to have to put my feet down a lot for stops, I'll just pump them up 1 to 1.5" (mine are full height, which is a 13" shock from eye to eye, and have a total of 3.25" of travel), which allows me decent footing for stops, but does not compromise the ride quality on normal road surfaces. The only time they are all the way down is when I'm parked and need to walk the bike backward/forward. With a 29" inseam, I have to do something to get better footing, particularly when parked. It doesn't matter if you're 6'10", once these bikes get over to a certain point, you can't hold them up. Rooster is correct with is comment about the Legend compressor...it is slower to pump the shocks up, but that's not an issue for me, or hasn't been.
BTW...NO bike should sag 2" under load. If it does, the shocks are not properly adjusted for preload.