All of us have been Wardens for over a decade now, so we'll find out at some point, I suppose.
There's- One Warden has been cured, that we know of, but it's not something we actively search for unless it's a fake Calling. Our lives are forfeit when we become Wardens, for a good cause. Thedas needs ones who can fight the Blight, and kill Archdemons.