I have a pair of Aerotech shorts from back before they were Aerotech. (Used to be Schnaubelt Shorts) Egads these things are old, and I only wear them underneath cargo shorts when I'm running errands, but they're not *totally* worn out yet, and I'm cheap like that.
My Performance Century Gel bibs are only about 6 months old, and I'm pretty sure that I'll get 2 or 2.5 years out of them before I completely wear down the gel pad in them. I doubt it's going to be the lycra that gives out on them first, though.