We just took my wife's parents (76) on our Leopard 46 and they did great. His physical health is not that great - has great deal of difficulty walking and requires a cane and a lot of time to move about. On the boat there are plenty of things to hold on to and the lack of heeling made it easy for him. He even went snorkeling once. The greatest challenge is getting into/out of the dinghy. But with a couple of extra hands to help, he did fine.
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