DARLING in the FRANKXX

[Kraco]

The first pilot we saw piloting with 02 was an adult though...

I had totally forgotten what kind of a pilot it was, so I just assumed he was a young one as well. But if the pilots indeed can grow old, who knows. Maybe the old one was an older generation model with less potential but capable of living longer.

As for that poor Zero2 pilot we saw, I think I remember them saying pilots grow older insanely fast with Zero2 in Strelizia

One more thing I don't remember... I thought they just drop dead due to massive internal injuries. I would like to believe they don't normally have a blue cancerous growth in/on them like Hiro does. That might be Hiro's peculiarity, connected to the medical abnormality they observed, even thought it looked like Zero Two at least half expected it.