Here's a link to the official Watchmen movie site.
Pretty clearly, the producers and director decided that audiences were not going to come out for a middle-aged, paunchy Night-Owl, or a past-her-prime Silk Spectre.
Which kind of leaves me scratching my head. I'm not really sure what to make of the pics from this site, but if Ozymandias isn't old enough to ponder his legacy, then what's the point, really?
Yes, younger heroes will bring in the kiddies, but that was never really the point of Watchmen, was it? I am increasingly skeptical. V for Vendetta looked right, too, but missed the mark. And, perhaps because it came so close and then missed, it was all the more disappointing. Watchmen looks like more of the same.