I do love older dogs! I adopted an 11-year old greyhound and a 7/8-year old German Spitz (though 7 and 8 are still pretty "young" for a spitz!).
I'm hoping older shelties are a little less hyper and bark less than youngsters. These two seem quite mellow. I feel bad for everyone involved. The man who lost his wife, and now has such deteriorating health he can't keep his dogs, the dogs themselves, and of course the wonderful woman who has looked after them for 6 months while the owner was in the hospital. I think the shelties have formed a bond to this "fosterer" and her wonderful husband who is home all the time now with his own health issues. They may grieve moving to my house.
But this lovely couple has many, many dogs of their own from the days of breeding and really don't have the room. By contrast, my little house isn't much but my huge garden and fields are! I hope the dogs like travelling because I do like to take my dogs with me....