A true old fart is one who knows he's an old fart and doesn't care what people think. Wear your old fart badge with pride on this brilliant coffee mug. Let everyone see how little you care. You are an old fart and you're damn proud of it.
There'll be no confusion anymore as to which mug's yours. They'll all know who you are. Now demand someone make you another brew, you beautiful old fart you.