Now mind y'all, there are big differences here in the USA between all of these different living arrangements.
A 55+ Community is just that, a bunch of homes-in varying sizes-in one age-restricted neighborhood.
There's Senior Living Communities, like the one Mother is in, all older folks, usually more than 55+, with services added at a cost, such as meals, activities, outings/appointments/shopping, etc, in the Community's provided vehicle, Health Care Providers (when needed) in house 24/7. You can move into Assisted Living or Memory Care (eyes on you at all times) Apartments within that same Community-which usually are in Apartment configurations.
DH & I lived in a 55+ neighborhood for many years in Southern Arizona, but found it chocking. Everyone wanted to know our business and if we didn't participate in the "Forced Fun" activities, you heard about it! GOTTA GO!
I would suggest (I'm lookin' at you
TastyReuben) that if one were thinking of buying a home in a 55+ community of any kind (condos, apartments, "single or double wides") look at the re-sale market within that community.
We got stung, badly, when we went to sell and get out.
Some folks living in those neighborhoods are quite elderly and for lack of putting any kinder, they had one foot an a banana peel and they other, well, you know what I mean.
When they did pass, their heirs wanted to sell and sell fast! They really didn't care too much about how much they got out of the sale, it wasn't theirs to begin with. They'd sell to the first person who came along at any price.
We were so under cut because of the "comps" around us - beware!