So I did some research (grueling trips to IMBD and Wikipedia), and it turns out I had the wrong impression about Alexander Skarsgard's age. I thought he was in his late thirties. As it turns out, he is 32. Bale became became around the same age.
With that said, my one and only choice for Aquaman is officially Skarsgard., atleast for the next year or two. And while I again point out that I like going with younger casting choices, it's usually because I want most superheroes to be fresh faced for an origin. But after the origin movie is told, I wouldn't pay attention to age anymore, or atleast I think I wouldn't. At that point, the actor has become the character if there performance is good. Would it be a gamble to go with a 32-33 year old, yes it would, because in hollywood one of two things happen as an actor ages. One, they virtually look the same despite aging and going into there late thirties and early forties. Or, the older they get the more they fall apart. But Skarsgard being the awesome m-fer that he is, I think it's worth that gamble.
Plus, it would silly for Aquaman battling to become King of Atlantis while be playing by a babyfaced 25 year old. You need someone who looks older and established. And for Aquaman to be successful and taking seriously, an actor who can bring the rugged nobility and sense of purpose like Skarsgard.
And although I still need to read up some more before I have a true grasp on the charactes, my eaarly choice for Vudko is Anthony Stewart Head and Scout Taylor-Compton as Deep Blue, I've had a thing for Compton since watching her in Halloween. I think can be a somebody. Not a JLC like star, but a somebody who will get alot of roles throughout her career.