I thought of the domain age being a factor, but I don't believe that's it. I have a lot of old domains and haven't seen any big jumps. I'm thinking some of the old domains that we're seeing are mostly text, vs images and videos, and hence they load faster. Could be bump for page speed because textual pages just load faster. Along that same line of thinking, if Google made on-site factors, especially text on the page, more relevant that could do it for some of these domains.
The only reasons that I can think of youtube videos doing well (other than the fact that google owns youtube) is because of the time spent viewing the videos coupled with the pr bump they get for just being on youtube. Of course, if they've gone viral on facebook and twitter, that could help too. Again, with youtube not allowing actual porn, those videos just shouldn't show up for adult searches.
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