Hunter was a sickly child, I knew it even then. He could never have survived but for the blood.
Gideon starts to age incredibly fast with a short period time and explains to the shocked reporter/journalist that he needs fresh Predator organs, all evidence points towards the heart of a Predator, as his transplants can only stave off old age for so long and that over the centuries, he had hired men to obtain him these Predator body parts no matter what. After a quick surgery. Gideon quickly recovers and leads the hunt in an effort to find the Predators and secure their bodies, dead or alive.
And from Dutch’s Audio Tapes, the blood can slow the aging process
See it can’t make you a hybrid being a total “Predator hunter killer” (see what I did there lol)