Live with adult children & grandchildren?

Any advice - I need to make a tough decision to either move with my adult daughter & my 2 grandchildren to a “multi generational home” or go myself to an over 55 community. The community has lots of activities, but many of them I can no longer do because of physical limitations (I am only 65, but walking is limited). I feel like I would have a better chance to meet people & make friends in the community, but it could  be hard because I can’t do a lot. I don’t want to move there & end up sitting in a house all alone.