While not "old lenses" in the context of this posting, I have used my 17-55mm f/2.8 IS lens and 70-200mm f/4L IS lens on four generations of DSLR cameras (30D, 40D, 7D and 7D2) and if you consider the 70-200mm alone, you can add the 5D2 to that lineup.
They are expensive lenses but the pro-rated cost over quite a few years and thousands upon thousands of images is really quite low.
I purchased a used 300mm f/4L IS lens years ago and used it on the 40D, 7D 7D2 and 5D2. After I sold the lens, I calculated the bottom line cost over the years of use. Pro-rated after selling the lens, my bottom line cost was about one U.S. Dollar per month. That is a pretty darned low priced LENS RENTAL
BTW: I replaced that lens and the 400mm f/5.6L lens with the 100-400mm f/4.5-5.6L IS II lens which I do like better. However, the 300L and 400L are still very capable of producing great imagery and are amazing bargains...