So I was thinking about how morphing works, and it hit me. Do morphs age? I'm not talking about nothlit situations here, just ordinary morphs while they're in Zero-space storage. It seems to me that there's no reason for it to happen. When you acquire a morph, you basically take in a genetic snapshot of the body, and that's what the cloned for is based off of. Insects only live so long, and they never mention having to replace their flea or fly morphs.
That said, they also never say anything about Tobias. If he acquired his thirteen year old body as a morph, wouldn't he still be biologically thirteen by the end of the series?
Just a thought.