What's a good list of places to see in China for 5 to 7 days for a group with elderly people?

Well, what kind of places are you interested in? Natural scenery, historic sites, beach or ancient town? If this is your first time here, I think Beijing and Shanghai should be in your list. To ease the trip, you could ask an agent to arrange comfortable transportation.

Already been to Beijing and Shanghai. Natural scenery (as the mountains in Guilin, the west lake..) would be great.

no more temple and mausoleum pls.