we have a group on our site, squash, adults with learning difficulties..they just have 1 long, 22' raised bed and a 12' raised bed in the polytunnel.
all around is a 3' path as a few are in wheelchairs, some just come for a cuppa and a chat, some come to do a bit of weeding, planting etc, all with their carers, we do have one or two carers who think it's our job to do the looking after :)