It hadn't aged a bit, in fact it only gets better with each viewing. Unlike the awful remakes where they cast wrestlers and big name Hollywood stars as the guards and inmates, this one casts real tough looking men and it just works. Obviously the film needs a few main stars to carry it's weight but I thought the casting choices were spot on. Reynolds is fantastic as the quarterback Paul Crewe, and the guards are all mean as hell.
I love this film and if you haven't seen it, please correct that.