You can't throw a 20-year old into the cleanup spot of a Major League team, especially not right away. Let him prove himself in the six or seven spot, then gradually move him into 'better' spots in the lineup.
Wasn't Cabrera 20 when he batted clean-up in the World Series?
But when he was first brought up, did he bat cleanup? (I am not disproving your point, I am legitimately asking the question.)
no, cabrera hit seventh when he first came up