My 11 year old is feeling his age, too. The vet prescribed gabapentin and told is to raise his dog dishes and get doggie stairs so he can get onto the bed more easily.
It is hard. If only they could talk and tell us where it hurts. Our guy seems to be having hearing and sight issues, too. Not horrible yet, but he doesn’t hear someone at the door and spaz out so much anymore. And he sleeps a ton. Sigh.