MuddyBoots, your vet sounds alot like mine. If I take a critter in wondering if it is time to say good bye she'll ask my expectations. My goal with all is for them to have quality of life. If there are some things we can do to buy some time I'm willing, but not if the animal will suffer.
I think I've told this story here before. I had a yellow lab that was my heartdog. Old age caught up to him. My vet suggested some practical things I could do to help him - booties so he did not slip on my vinyl flooring, diapers for when he could not control his bladder. It bought him another few months. He could todder around the house and yard. Enjoyed spending time with me. Then one day her could no longer do those things. I asked and he told me he was ready to go. I appreciate that my vet doesn't push for extra testing or expensive treatments.