I strongly dislike ALFs, but SNFs are great places.
My grandmother is in a SNF because of her repeated falls. It just was no longer feasible for my mother to wake up at 3am and hoist my rather sturdy grandmother from the floor where she'd fallen to, to get her back into bed. My family has made her area at the SNF prettier than her room at home ever was, and she has real furniture that we provided, a television, fresh clothes (my mom does the laundry for her), snacks, good food (we bring her hot, home-cooked food as often as possible), the skincare products of her choice, etc.. She is not with us 24/7 but then again she hadn't been for a long time. She lived with my parents from 1977 up until 2009 or 2010. It was time to place her somewhere a nurse would be available, and where the ambulance could get her to a hospital if something more serious happened, in far faster time.
To the OP, I would suggest that you invest in an ALF if you'd like, or a "senior community," which is basically a fancy way of saying it's an ALF where you each get a house instead of a room/apartment. If you really are interested in helping seniors, I am 100% certain there is a nearby facility that will take your donations of time, money, and materials.