EndreWhiteMane: Old Whining One suits me in RL. (Not really but I get picked on a lot for it. When something important isn't getting done I complain a lot, and loudly, until it does.) Old Grumpy One would probably be better. ;-)
Edit: I'm jk, it'll get changed when I find something appropriate.
CarrionCrow: The distinguished captain Sterling Von Gravelpants. (Why Gravelpants? Well, if you had gravel in your pants, you'd probably be a bit grumpy about it. -laughs-)
:-O How true. ;)
EndreWhiteMane: Another good one. (taking notes) ;)
CarrionCrow: "Get off my lawn!" Works with the whole age angle. -laughs-
Edit: It also makes me laugh, may be a keeper. ;)