Dogs not getting along.

I have an elderly dog at the age of 16, for his life he's been mostly the only dog in our house other than the occasional visit from other dogs. Now we have another dog who has been abandoned that we are fostering until we can find a suitable home for him, this new dog is 2 years old and is a bundle of energy and doesn't have much training (we are working on that). The problem we are facing right now is my dog Max (16 years old) is set in his ways, he loves his toys but he won't share them with Tucker (2 year old), Max also gets anxious when Tucker is too excited. It's coming down to whether we force Tucker to not play (hes still very much a puppy) to keep Max calm or we allow Tucker to play that upsets Max (who also has a heart condition). We live in a small house so we are unable to separate them.

So my question is how do I get my dog Max to relax around Tucker so it's not so stressful on him. Tucker needs something to play with as he's destroying everything in our house but bringing out the dog toys creates chaos.