User blog comment:MrSolomon/MGQ Fanfic: War of the Seraphim/@comment-2037710-20150401083629/@comment-2037710-20150402082537

Age and lifespan is a really odd topic in MGQ. Sphinx said she could make her husband live longer by turning him into a monster, and Alice XVI states that Luka's lifespan is undoubtedly longer than a normal human and possibly longer than her's due to his bloodline. And again, advancements in technology could allow for longer living.

I have a feeling somehow Shadow will fit in... Well, let's not forget his birth parents and mentor... But his inclusion is entirely your decision.