I'm excited to see Roger back, but honestly his age scares the hell out of me. The skill is still there, but the body may not be. Any 45 year old is high risk for injury.
The good thing about pitchers that are old is that unlike somebody in their early 20s you don't have to worry about injury to their arm as much from pitching like you do for the other people. Unfortunately, it's the rest of their body that has a greater chance of breaking down.