Personally the age of the stunt-cock doesn't bother me. The only thing about their appearance that bothers me is are too many tattoos/piercings since I find it visually distracting.
My number one demand is quiet from them. Once the sex starts, unless the scene specifically calls for dialog that enhances the scene, I want no talking or sounds of any kind coming from the prop.
I also tend away from the "enormous" penis scenes. It doesn't do it for me. It seems to be for guys who want to see gigantic penises more than guys who want to see girls. [Though I guess girls or guys with enormous penises might like it as well].
Bottomline: I like the GIRL to be the focus of the clip. Not the piston. Nor the loser to whom said piston is attached.
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Amo i Gemelli!!