I'm saying he's done more than color over the years... I took some pictures on Zoo TV where I got the back of his head and let's just say there's more there now than there was then! Sorry Bono... I'm right there with you. Except I stopped washing the grey out a year or so ago...
Yeah, I don't think Bono would pass from dying his hair all these years blonde/brown/black to all of a sudden appear all grey.
I am of the opinion it's time to accept the silver hair (Adam looks great) and go for it, Same with Edge: drop the beanie man, nothing wrong with being bald. We're either there or going that way pretty fast.