Hi Welshlibranr. We have done what Wheaters did and get a young pup when our old dog was middle aged and it's been great.
We have Charlie who is 11 and Toby who is 6. I said last year that when both these two leave us, that's it, no more dogs, I'm getting too old. However, as you may know my husband died in February and really the thought of coming back to an empty house every night fills me with dread. So, I Will probably get another dog when they have both gone. So I would say, go for it. Chrissa