Ben, I'm not planning on hitting middle age. I'm gonna skip right to the old and decrepit stage, and pay my grandchildren to haul my crap around for me, including a 3 pound, 5 inch thick, super duper ultra comfortable air mat.
All kidding aside, I'm hoping that as long as I keep acclimated to the air mat, my body will never know anything different. Well, actually it does know different......my first overnighter ever, my girlfriend and I slept out in winter. We camped on a solid sheet of ice (not hard snow, ICE) and we only had one mattress. She got that. I got the ice. And I wondered why I was cold in my crappy, 5 pound, Slumberjack-lyin'-that-its-a-negative-25-degree-bag-piece-of-crap. Bollocks. I love my down mat, and you can pry it from my cold, dead hands!