An Adult.
I kid, I kid. I'd LOVE to be The Doctor. Seriously. I'd take Mum out to explore all that history she's so fascinated with, check out the future, have a blast exploring space. That would be the ultimate fulfilment, to learn ANYTHING. And to share it with someone, cause what's the point if you're alone?
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Every time you think you've made it idiot proof, someone comes along and invents a better idiot.
?the end of our exploring, will be to arrive where we started, and know the place for the first time. - T.S. Eliot