A Buick Estate Wagon with all the seats folded down. A Chevy Astro Van, the commercial model with no side windows. Or perhaps locate a used hearse. Many have a roller floor and tie-down hard points…
Be careful with that statement. While I agree with the importance of proper lafting technique, degenerative disc disease is common in 60 year old people, and is often not a problem until the spine is overstressed and a disc pops (bulges or has a nuclear or annular herniation). That can cause all sorts of pain. Once that happens in someone of that age it typically results in a permanent and chronic degenerative spine problem. For a 60 year old who hasn’t led an active life, it’s better not to take the chance.
Trust me on that one. I’ve spent way too much time disabled and on painkillers as well as getting epidural cortisone injections and discussing surgical options. Herniation, stenosis (central and branch), herniation, osteoarthritis of the facet joints, spurs,…these have all become part of my normal vocabulary. I strongly recommend that anyone not regularly active at 60 not take unnecessary chances. It ain’t worth it.
My boyfriend is a musician (keyboards). He has lots of large, very heavy equipment. He has been looking into a Chevy HHR. The best solution is to be rich enough to have some music slaves to load and unload it for you though 
Check out a used, prior to 06, RAV4. They have no bumper and loading is VERY easy. The door opens to the side and you load with no sill…just don’t take a “rear end collision”. I’ve used a couple of car ramps to slide a generator right up into the back.
I concur with the suggestion to find a station wagon. There are a few available again and you should get better fuel mileage than with a box-shaped vehicle. You need a simple and inexpensive home made wooden ramp that will stow into the wagon with the rear seat folded or even removed and of course, casters on your heavier equipment containers. The wagon’s rear door must open to floor level. To reduce the temptation for someone to steal your equipment, consider tinting the rear windows darkly consistent with your state’s laws.