Skills to learn to avoid age discrimination (specifically .net)

I am an asp.net programmer and I am getting up there in my age. I wanted to know, from your experience, what skills (please be as specific as possible) would you focus on (.net or generic), what skills would you make sure you are razor sharp on, in order to avoid age discrimination?

I have heard from a few recruiters that I have "alot" of experience. I don't know if that would mean that I am too old.