Ljay, Friedman is simply saying they seem young for the roles, not that they shouldn't play it or anything, and he's right regardless of what Trevor Nunn thinks. I'm not sure if Friedman is correct on this one but I love his scoop, he's usually pretty reliable and his info tends to come from very good sources. Recently he was the first one to report on the Haiti telethon after George Clooney told him at one of the pre-Oscar events and he also was the first to report on the idea of re-recording We Are the World after the Grammys.
Either way, I must say I would kinda pee my pants if this were to happen, I think they would both be excellent in the parts and Paltrow has been on stage before.
"Some people can thrive and bloom living life in a living room, that's perfect for some people of one hundred and five. But I at least gotta try, when I think of all the sights that I gotta see, all the places I gotta play, all the things that I gotta be at"