One thing... an older RV has way fewer things to go wrong with it. We wouldn't consider buying a new one nowadays with all the stuff on it and all the slides. We sold our 10 year-old Newmar '04 Dutch Star for what we considered a very good price. We full-timed in it for 8 years and part-timed 2 yr. It was in awesome condition and well-maintained. You can't make a blanket statement about stuff needing replacement. Yes, things will.... eventually, but everything is not going to go wrong at the same time.
Many folks think an older RV is just fine with them. They don't need all the gadgets and glitz that are found in newer ones. If the OP has it checked out thoroughy by a competent service technician and the price is right for him, then there shouldn't be any problem buying it. For what he'd save buying this one over a new or newer one, he could have repairs done.
Redecorating doesn't have to cost that much, such as new flooring. Our 10-yr-old carpet was immaculate. We never wore shoes in the house and had a runner for the high traffic area in the living room.
I think full-timers take care of their RVs perhaps better than some weekenders. They have to rely on it running without issues. It's their home.