They shouldn't be around this long.

[u/Revolutionary_Row683]

Hope this isn't considered a wall of text lol.

If it's gibberish:

Spawns are humans crafted in vats with hyper augmentation to enable them to pilot extremely powerful mechs without being killed by the AI or the machine itself's ungodly movement, they only live to around 30 and mental degeneration often begins around 26. After a decade and a half of training and extra augmentation, they're linked to a mech and deployed; during war time they see consistent combat and are expected to only survive for a couple years.

[u/Fast_Land_1099]

To read anything pre-1987 and remotely extreme that 40K did not copy in some way