How old is Shakespeare's Iago?

(From Guardian Unlimited)

Watching Dominic West's superb performance as Shakespeare's consummate deceiver, Iago, at the Sheffield Crucible recently, I heard him slip in an extra falsehood not usually found in the text: in this production, the villain even "lied" about his age.

On the page, Iago maintains that he is 28, telling Roderigo in Act I, Scene iii: "I have looked upon the world for four times seven years." (Twenty-eight, if your mental arithmetic is feeling rusty.) West, who turned 42 as his Crucible run ended on 15 October, tweaked this to "five times seven years". And fair enough: he doesn't look a day over 35 -- nor is he the first actor to have aged Iago …