He saunters out onstage, and the first thing you think is, man, Steve Jobs looks old. The second thing you think is, no, not old: He finally looks his age. Well into his forties, Jobs appeared to have pulled off some kind of unholy Dorian Gray maneuver. But now, at 52, his hair is seriously thinning, his frame frail-seeming, his gait halting and labored. His striking facial features—the aquiline n