You are the Alpha dog! Remember your the leader of the pack!
But, for your older dog to remain alpha dog to the other you must always feed him first, give treats to him first and so on. But, you must let them know that you are the one that is in charge. My 8 year old yorkie is the alpha of his 5 yr old sister yorkie and his 4 year old Siberian Huskey brother.
. Just follow the simple rules and all will go well.