Steel framed touring bike (Trek 520, Surly Long Haul Trucker, Kona Sutra, Rocky Mountain Sherpa, 100s others). Parts will wear out over time, but all are easily replaceable. Short of being hit by a truck or bear, the frame will out last you (if you are still on it when either of those potential events occur, it will probably survive better than you). Touring frames made in the 70s are still seeing service hauling people and gear across the globe. Good luck finding one on CL though, because they last so long almost no one ever sells one (after waiting six months for one to show up on my local CL, I jsut bought new).
Manual Focus Lenses (Lieca, Olympus, Nikon, Canon, Pentax, Sigma, etc). No motors to wear. Put a UV filter up front to protect the glass, and keep it out of the dust and rain (unless you buy a weather sealed model, in which case just put the filter on and forget). My favourite lens is as old as I am, and the one I use for shooting sports is 6 years older than I am.