system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:If you could teleport a caveman into the modern age at birth, and then raised him as a normal modern child, what would happen?

By ordinary child of today I mean ordinary western upper middle-class child of today, as unfortunately even in modern times most children are not allowed as many opportunities as they should be. But for the sake of the question, if this caveman were to attend normal schooling and then (assuming he was capable of the step up) university. Would he be just another citizen? What about physically and even psychologically? Would he just be completely unable to learn the language of his host nation despite growing up immersed in it? Has this been done already and if so was George Bush a test specimen (haha I made a political funny)? Thanks in advance.
gpt
First, you'd have to differentiate what you mean by "caveman." Are you talking an actual Homo Sapiens or are you referring to one of our ancestors like Homo Erectus? The brain structure of our ancestors was somewhat different than ours so they would have processed information differently.

Assuming we're talking about an actual Homo Sapiens, die, most likely. He would not have the resistance to modern diseases that we do nor would he have any tolerance for pollutants that characterize our modern world. He could be vaccinated but he wouldn't have any of the natural resistance that most modern humans are born with by virtue of being born out of generations that survived wave after wave of lethal plagues. Our food is also radically different than his system would be accustomed to so he would likely have serious problems with modern food, never having had to process it before. 

Suspending that, he'd likely grow up just like any other child. There was nothing strikingly different from early Homo Sapiens than from us, simply because they had a lower level of technology does not make them stupid. He would physically probably be shorter but other than that he would probably develop into a relatively normal person.