>>283195256
Ok, so we have anime Spike. He is still young at 27, he is a smart, handsome man with plenty of skills, he certainly has connections (he's met people while traveling) so realistically he could change careers a live a long, fulfilling life, but that requires him to let go of the past and grow. He is unable and unwilling to do that so he has an arrested development.
The series even gives us a glimpse of an older bounty hunter: Jet. Both his storyline and his role in the series doesn't make he seem heroic but like a mercenary that's way past his prime and running away from his past until he inevitably dies pointlessly in a bounty hunt. That's also the ending that awaits Spike if he doesn't resolve his inner conflict. Hell, Spike's last standing doesn't even look like heroism or martyrdom, it looks like a man surrendering and killing himself.
A Spike that lives to be 50 is unlikely but even if it happens he would still be pretty much the same guy he was at 27 because he's mentally and emotionally stuck in his late teens. A 50-year old Spike that surrenders to his past and kills himself recklessly would be less tragic but it could still work if the series was well written, because even at 50 there is an opportunity to change and grow, but the Netflix series had shit writers and an even shittier script.
They likely chose that man for the role to avoid the Ghost in the Shell "controversy" in which a bunch of tumblrinas boycotted the movie for "whitewashing" the main character.