He's trying to kill us--could ruin him--worry about that later--grab your sister and go.
"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."
"...My first instinct is to offer to try to do it for free for one elf to see if it's the same."
"I'm not even going to consider long-term commitments until I'm sure my sister's okay but I'm not ruling anything out until then either."
...Less boring than several hours floating in the void of space. Presumably. What's an angle?
Odette pokes at her with her Sympathy senses. There isn't much in the way of meaningful difference. Since she's an elf, she looks like sixty instead of twenty when Odette's done with her, not that Odette has been informed of that.
Odette isn't going to say she's done for a good long time. Helping people! Adding decades onto peoples' lives! Best thing!