I don't think they are taking them just because they are younger, but age is a consideration when comparing 2 players they are looking at. What I mean by that is do they feel, when comparing Player A (21), when he turns the same age as Player B (23), is the projection curve that Player A will be a better player at that age (23), and beyond? If not you take Player B. Drafting is projection for how will they will adapt and progress to the NFL game. We know they were good in college, but does their game project to being a successful Pro. Gute even said they are now taking NIL transfer portal success into consideration... After they transferred, did they adapt and pick up the new system quickly and improve from the prior year, because that is basically what happens when moving from college to the NFL. If they struggled, is that a sign that they aren't as good at adapting to change?
Aside for the early 1st Rd elite Draft picks, these guys are all really just depth pieces, who you hope can contribute in year one as rotational pieces, or can step in to start, due to a veteran injury. Year 2 and 3 is where they truly compete to being starters, and I think that is where the casual fan struggles with the Draft aspect of the NFL. They think that every draft pick needs to be a starter in year one, or why did we draft him, we have 2 good players there right now. Executives think of it as who is up for a contract extension, do we want to pay that guy another contract? No, we don't, so let's draft his replacement now, so next year he can be their replacement, or this year if we have an injury he would be better option than what we have at backup right now. A position of strength can become a position of weakness quickly with injuries.