system
Given the following post, respond as if you're commenting on Reddit:
human
[Evangelion] Why can Evangelion units only be piloted by children?
gpt
BTW SPOILERS.

Not children, the specific children that were prepared for the purpose. Their mothers were sacrificed in order the create the evas. That is the reason that they can sync with the evas, all accept rei who is a clone of shinji's mother as is her eva.