I'm sorry to hear about your friend and brother Hels001 that's tough.
You are certainly not too old at 57 to take on a puppy. Our dogs bring such love and companionship don't they, as well as fun. A reason to be up and out every day. We have just taken on our second rescue dog and we are 75, they keep us fit. We have made sure they will be looked after should we not be able to do it.
There are schemes in the UK I think with Dogs Trust and Cinnamon Trust to ensure your dog will be cared for if you are not able to do it anymore. Enjoy your puppy.
Anger management!!! Help needed.