"Yeah, yeah, whatever you say, kid. Let me guess, you're another ancient demon lord who lost all her powers and now you need a stool to reach the top shelf?"

But he does believe her, despite his attitude. No reason not to when he's met plenty of slow-aging races already. Twelve-thousand years sounds pretty ridiculous, but he can at least believe she's way older than him.

"It's not junk, so keep your hands off. These are all perfectly serviceable machines, hand-picked by me to use in this experiment. Unless you're interested in becoming my latest test subject, I'd suggest you stand back, kukukuku."

There's a flash and a loud crack of thunder in the distance, providing the perfect dramatic lighting for his ominous chuckle.