The sad part is that rats only live about 2 years or so. It sounds like Smudge did have a lovely long life really and was a well loved and cared for pet who will be greatly missed. Tell anyone who gives you the "it was JUST a rat" comment that love isn't bound by species and it's too bad they think only certain animals "deserve" our care and attention. Rats actually make wonderful pets but even if they aren't a pet they are still a living creature that we house and tend so they deserve respect for that if nothing else. Even my feeder rats get the best life I can provide. I know I'll be sad for every breeder that eventually passes away because they are named and I know them each by their unique little rattie selves.
If you have some pics we'd love if you want to share them.