I'd look twice at a place in Kerrville on the river; that sounds like it would be very niceVery VERY preliminary, I would say...
Mid-60's is the new 30, after all (I am 64 in two months).
That said, my dad was researching a couple years back and found a place near Kerrville with cottages on the river. So you are kind of still in a house. It had shared trails, so a little space. If your health declined you could move into their assisted living apartments ($$$$).
I know the location is not a match for you, but maybe the same idea?