re: Hatred toward co worker

Seems like he is immature for thinking his age alone warrants respect. You don't want to be treated like a child, and yet your mentality is that of a spoiled brat in this case. If the issue really is this bad, talk to the man like a man and solve your problem. I'm sure your boss would appreciate this more than finding out that in some way you're potentially hurt business by feeding a coworker false information.

On second thought, being the bigger man will likely just piss him off. Write your boss an anonymous letter with specific false instances of when this crotchety bastard illustrated how much better off the company would be under his leadership. Include the fact that old man also stipulated the boss' spouse and mistress would be better off with him as well.