Doodledog
I wouldn't take a rescue dog from a shelter, as you'd have no idea what had happened in the life that led to the rescue, but if you can find a dog that is in need of rehoming (eg because of the death or illness of its owner, or for other reasons that don't involve ill-treatment) it could be an answer. My son's dog, for instance, was bought as company for an older dog but it didn't work out. The older dog was aggressive towards him, and the owners put him up for sale. He is a lovely dog, and very happy in his new life with my son and DIL.
I know people who have taken dogs from shelters and had a lot of problems because they didn't know the reasons why the dog had been rescued, so couldn't deal with them.
Another consideration might be that a puppy will grow up with you and will adjust to your routines and pace - maybe more easily than an older dog might be able to do.
Doodle dog, you could consider being a foster carer.
They put a dog that matches your abilities with you until they find a forever home for it. It could be weeks or many months.The Dogs Trust do this.
Also, the Blind dog association need foster carers for their potential dogs for the blind. They cover all expenses,food, vet’s bills, everything, but, you have to say goodbye after 12 months. However, you then start again with another puppy.
I am 73, husband is 79 but 25 from the neck down!Fit as a fiddle, but that can change in a split second, we’ve all, at our age, witnessed that.
I’m desperate for another dog but I daren’t do that, as it would outlive me for certain.!My last one died 2 months ago. But, I can’t believe how ‘free’ I feel……
Try fostering first, that might just scratch the itch…