Yeah, but his point is that something totally, completely new, like say, a direct brain interface, is going to be so radically different that he'll have a hard

Yeah, but his point is that something totally, completely new, like say, a direct brain interface, is going to be so radically different that he'll have a hard time becoming acquainted with it given his existing experience. In my interactions with older relatives, the thing I find that they have the biggest problem with is that they don't try to explore how the computer behaves because the are afraid of breaking something. So, personally, I think that Apple should advertise it's guest mode for OS X additionally as a "Learn New Things" mode where they very clearly explain that any changes they make are not going to be permanent and that by shutting off the computer, everything can go back to normal (maybe create a simulated web as well). Then there could be a series of tutorial on making significant, (normally) permanent changes to the computer's behavior.