Actually, I think the vets will win. Both Al and Millsap will often command the double teams, clearing out the space for the 3-point shooters and Mo/Foye are much better at hitting quick or contested 3-pointers than Hayward or Burks (and even Marvin does it better than Carrol). Plus Mo's ballhandling is better than Burks' or Hayward's: he can penetrate, collapse the defense and dish out better than them.
On the other side of the court there is no need to doubleteam Favors, and Big Al is probably the best big in the league to guard Kanter one-on-one - he taught Kanter most of his low post moves and can easily recognize which one he is going to pull on him and what Kanter's limitations are. After all, quite a bit of Kanter's success in the recent games is due to the fact that the opponents do not have enough scouting on him - unlike Jefferson. The only chance the young team has is if Foye turns stone cold (which happens rather often lately), or Mo gets stuck in the (unsuccessful) hero ball. If Foye is reasonably hot and Mo plays on his November-December level ... then the young squad does not stand a chance.