*nods* I pretty much agree with you there. The 'fixed point' thing really does for it. He can't be a fixed point in space and time and turn into a giant, dead old face. I'd go so far as to say he shouldn't age at all. Especially since he can regenerate himself after being injured.
Jack the drug addicted prostitute probably isn't beyond the realms of possibility...
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Jack the drug addicted prostitute probably isn't beyond the realms of possibility...