My wife and I would love to join you on your early summer Grand trip. We are mid 50's, have good knowledge of the river and side hikes. Can contribute 16' raft and some group gear, help with logistics.
...not to mention an interesting array of lightning and leopard print tights!
I'm already signed up for a trip that is full so I can't help ya out, but I wish you luck. Had a great time with you last year and can vouch for him being worth having on a trip. He really rolled with the punches and kept his head despite a hard and stressful situation that happened on the trip that would have set a few others over the edge.
If you're needing a quality couple on your trip, Lee and Cheryl are simply the best, I nicknamed them the "Energizer Bunnies" of boating!! Not to mention "Movie night". Very much quality folk that you need to have along on your trip !!!