I don't know if there's a way of really knowing if the NFL does that unless someone here has been in those draft/war rooms and someone has said, "Hey he's a great player but he's too young to draft. Lets pick this other guy, same numbers but older."
So I certainly don't know. I don't have an NFL scout(s) on my rolodex. I was strictly mentioning that there are many, many comments on this site regarding this. There's several that have outright said that they believe the NFL does do this.
I'd love to see actual numbers of younger players drafted, their college numbers, whom they played and then look at the rest of the draft class to see who was drafted before/after that younger player. But that would be some heavy lifting. I don't want to go through all of that, personally. But for me, that's the only way I'd be swayed either way. Antidotal evidence isn't evidence to me. Meh. I'll have to figure out how to survive without knowing definitively. lol.
But interesting juxtaposition, I think. There's a move to get into the draft early. Yet there's at least a concept out there (accurate or not) that the NFL doesn't like drafting younger players. Players are the only ones that would get screwed in that situation.