My RWS I bought back in 1974 is well worn with the edges darkened from age, but still intact. I don't use it much for reading for other people anymore though I still use it for myself as it's by far the one that has seen the most use. A close runner up is my Hoi Polloi deck which was given to me as a Christmas gift around 1975 or so. I don't read with that one anymore. I have a few that showed wear when I bought them since they were old, secondhand versions to begin with.
I know a lot of books say you should keep newer, crisper looking decks especially if you are doing a reading for hire. However, I have mostly gotten positive feedback from people. I remember one man comparing my old RWS to his friend's new, shiny deck and saying, "Now that's how a Tarot deck should look!". Generally, I suppose people think you must have a lot of experience to have such a worn looking deck. I doesn't occur to them that the wear and tear might be pre-existing lol.