Does your dog have a lot of energy?

My dog is about 13 years old, and he's still bustling! Granted, he's not too keen on the dog park or going for walks anymore, but he loves going outside and playing! He still loves his toys, treats, and when his collar isn't on him he refuses to let go of it or let it out of his sight. He loves getting pet, and will gladly sit there and fall asleep no matter who it is (such a great guard dog....). He is a happy go lucky guy, but so stubborn. What else would you expect from an old grump like him? I hope he has a lot more years ahead of him, as he is healthy right now and still excited about things.