"Ahem. Madame, I wouldn't mind losing a few years, perhaps to just the other side of 30?"
"Where are you from, young man?"
"France, Madame," he replied.
"Ah, they use metric there. Hm?"
"Yes, we invented it. Is there a problem?"
"No. Just trying to remember the conversion formula for metric."
"Huh?"
"Well, there are certain international magical accords that I must abide by. Now let's see, I think for every five metric years you lose he gains nine. So, we'll give him 18 years when we take 10 of yours."
"Cool."
"Silence. I begin." She closes her eyes entering a trance.