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You might. Though I guess if anyone saw your real body in its pod, they'd be able to tell you.
[Though unfortunately determining his age from how he looked in his pod would be a bit harder. Ianto didn't mention him looking particularly older, but at the rate he ages that only narrows it down to the next few millennia.
He shrugs, and lets it go, giving Artemis a faint leer instead.] For what it's worth, you made a very hot 20 year-old!