Interesting choice for Superman. I'm not really that familiar with the actor, but he looks more like Bruce than Clark to me. That being said, I'm looking forward to his portrayal of Superman. If it's like they did with Arrow, Flash and Supergirl, we should see the first picture of him in the suit in the coming weeks.
As far as his age, Henry Cavill was about 28-29 during the filming of MOS playing a Superman that was supposed to be a few years older (33, I think). Maybe they could do the same with this guy. They could say his Superman is mid-Thirties and the reason he looks so young is that he ages slower.
The only thing that gives me concern is how he will look next to Jimmy. I wonder if TPTB might have painted themselves into a corner by casting someone who looks like a footballer or underwear model as Jimmy. I feel whoever plays Superman will just look smaller in comparison. Here's hoping they'll figure out how to make that work.
It's going to be nice seeing Superman on the small screen. I never really understood why he couldn't exist on both the big screen and the small screen at the same time.