This is what i will be doing when i am 80. Good times.
About 5 years ago (maybe more), i met 93 and 94 year old men on the summit of Mt. Seymour. Good on them for still given 'er at that age. I don't think they were AWOL.
Another nice thing about buying new is that you can get all the latest light-weight stuff. I bought my rack only 5 years ago and if figure if i replaced all my cams and biners it would be 2/3 the weight or less.
Try holding a neutrino draw in one hand and a regular draw in the other an see for yourself. Do the same with an old #4 camalot and the new C4. The weight difference is phenominal. Makes me want to go out and replace my whole rack.