He's trying to kill us--could ruin him--worry about that later--grab your sister and go.
"Yeah. I've never taken more than a couple decades off someone before, but the principle's the same however much comes off."
"Um, if she's back home and not already dead it might be most important to get her out of where she is because I came here fleeing a murder attempt."
"I think I'd rather deal in currency. If there's anything left over when it's time to go home I can donate it to charity or something."
"I don't really know how much that is. How much would it cost to buy, oh, a novel or a loaf of bread?"
"...How difficult are these?" she asks of the services on the price sheet.
"Oh, I see. So..." she looks for the least expensive item on the list. "Maybe about as much as that? Because de-aging people isn't all that hard."
"I've only done a few decades before but it didn't feel like it was straining anything or anything."