Vader's age has nothing to do with it. He very well could be very old.What with his mechanical make up, and all, He could have had years added on to his life expectancy. He is however, "more machine than man." Also, vader does show signs of weakness, Before the emperor intercedes, luke basically beats Vader into gasping submission. I'd say that's a good sign of old age. The thing about this thory is though, how do you explain the sentimental death scene betwwen Vader and Luke? Why does Vader need so much to look upon luke with his own eyes, if the whole father son thing was just a facade? Overall this thory rocks, it really makes you stop and say, "Holy Shit!, What if?"
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