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I FINALLY FIGURED OUT MY FANTASY KINO WORLD
more detail in the following posts
gist: goblins and Orcs are not separate species in the greenskin race.
In my world, if a greenskin eats enough consistently (greenskins eat plants, meat, and some that are brutal and/or cunning will even do cannibalism.)
A goblin can become an Orc if it eats it's fill consistently, an Orc will become a goblin again if it starves consistently.
Greenskins can also live indefinitely but in such a brutal warlike culture it is very rare indeed for a greenskin to reach old ages commonly reached among elves.