It's religious group of old people.
In effect, a retirement village.
Excuse me, but, aren't there a _lot_ of single religion/culture retirement homes around?
Just a quick cycle down this list seems to point to a few on your side of the pond...
AAHSA
I see absolutely nothing wrong with wanting to spend, and the community as a whole providing for, your remaining years in a micro-community tending exclusively to the needs of your particular cultural niche.