BTW I don't think the Age curve has something to do with that. yes Players do Peak earlier but Teams also draft college Players who are usually 20-21 and sometimes older.
the Age curve doesn't really matter to the Teams because Teams mostly draft for the six control years. that is also one of the reasons why so many Teams have increased drafting college Players. the HS Players often have better careers but often a larger chunk of that Comes from the time after they are cheap. the most valuable years for a Team are the six control years and especially the first 3 years when a Player only receives the Minimum.
so for a Team having a HS Player in the bigs from 21-26 is not really an Advantage over a college Player from 24-29 because the HS Player will have a better career after that but he also will get super expensive.
so whether rutherford Plays in the Majors from 21-26 or 22-27 for the Yankees is not really an issue for them (as he is still at least a year younger than the youngest college Players). the issue is how much room for improvement they see at all.