(I've noticed that I type it a lot, so I'll just say that most if not all the changes I'm suggesting are to make it sound more natural in English, or generally help with the flow.)
 "how do you become a magician?" Of course, it's still perfectly fine to keep it as "how can you become a magician?"
 "You're about to say, I'm a magician now, aren't I?"
"That's not what I mean. I'm talking about being a Magician as a species. I'm wondering, how do you become one?"
 "...when you finally want to stop being human."
"Or when calling yourself human (gradually) starts sounding absurd." or "...(gradually) starts to sound absurd."
 "I'm still human, you know? I don't know how many decades before I'll actually become one."
 "But I won't lie. I'm interested in becoming a Magician as a species, too."
"For a human to become a Magician, you have to stop eating and aging, right?"
(Looking it up on the link, "abandoning temper" basically means "stopping your growth," or stop aging. It says "abandon temper" quite a bit, but it doesn't really flow well. I tried to change it up a bit so that it doesn't repeat the same words/phrases too often.)
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