Kennedy's a rather special case though in that he was the youngest president ever elected to office. That and I think you have to remember that to even be eligible to be President, one has to be at least 35. Contrast this with the Jedi where Luke (in his twenties ) is trying to train to be a Jedi and Yoda makes a comment about his age. It's about context, in my opinion, because when the youngest a President can possibly be is 35 then, yes, a man who was elected at 43 is comparably young. But with the Jedi -- if one can become a Jedi in one's twenties (as Luke does), then I find it significantly harder to believe that anything over 35 could be considered young. That's a pretty subjective point, to be fair, but I don't think your analogy holds very well due to the age limit for US President. Plus, consider that Kennedy died at 46 and (President or not) that's a very young age to die at, comparatively speaking. I understand that. But Luke's youth is a pretty serious plot point as it is also reflective of his inexperience and susceptibility. Vader also calls him a "boy." But that's really beside the point (for me). Han is noticeably older than Luke. Thus, it makes sense that he would teasingly, sarcastically, or endearingly call him "kid." With Vader and Obi-Wan, Shaw's ghost does not look younger than Guinness. I think it's a stretch to say they look even the same age given that there's almost a decade between them. Thus, Vader specifically using Ben's age as an insult is really rather odd when one takes the Shaw ghost into account. See, I agree with you and Toschestation in thinking that Yoda was just testing Luke's resolve, but I still think the fact that age was brought up is rather important. It seems a rather odd thing to bring up if it wasn't some sort of tradition or common practice. What I mean is, Luke can actively work to control his anger and reign in his impatience. He can't do anything to change his age. So Yoda bringing it up demonstrates (to me at least) that he's testing Luke's resolve by bringing up points that might prove difficult in Luke's training --> and Luke's unusually advanced age of starting is one of them. At least, that's what I take away from it.