To me, what they have done by resigning is not more significant than someone young in their career simply speaking out. It is commendable that they spoke out, but I don't see the resignations as adding much punch.
as a someone in graduate school for computer science [not cmu] I find this shocking and am INTENSELY curious about the details. hard to imagine a more effective resignation.
imagine if steve jobs resigned from apple because the boards was being sexist or something-I think that resignation would get a LOT of attention. that might be sorta similar to this situation.
First, because of their gravitas as prestigious researchers. (I'm actually a bit uncomfortable about that -- most people who experience gender discrimination haven't won Turing Awards, but we should still listen to them.)
Second, because sticking your neck out about gender issues guarantees a ferocious response and will make your life hell, so nobody does it whimsically. So what if they're not 35? Doing this at 75/80 is still incredibly unpleasant.
Like I said in my other post, I think we as members of the public do not have enough information to pass judgment. But if the Blums choose to say more, I hope we will all give them a fair hearing.