I think it might also depend on the ages of the 'seniors' there. I am technically a senior, being in my sixties, and I would use most things (well, not powder). I might buy a bath bomb or melt/bubble bar, but probably as a gift for my daughter/DIL. I don't take many baths. The 80 year olds I give to like the soap, but I don't think they would buy it - unless they already knew what handmade soap was like and found it to be worth the price. So I agree with Obsidian, smaller and less expensive soaps would sell better. They would maybe buy guest soaps though. They all like liquid soap - especially in the foamer bottles. I use a base for that as I'm not a LS maker - yet. My MIL likes lotion bars - but for travel. They might have some interest in lip balms, but I'd try to keep the price as close to what is available at Target, etc. None of them seemed to like body butter, scrubs, bath bombs - I'm not sure they even really understand the purpose of those products. My friends that are my age would be more likely to want some of those things.
Everyone likes cream/lotion. Keep in mind, these 80-somethings are just my family members and a few others, so it isn't a good cross section. And they are all pretty thrifty.
I will add, though, that my husband's aunt takes a bath every day (she prefers it to a shower) and does like those bath treats. Her husband draws her bath for her - which is so sweet. So there are some out there that would enjoy the bombs, etc.