I think that it's not only that older people didn't grow up with, say, the Windows interface or, as someone mentioned earlier, a telephone interface where you h

I think that it's not only that older people didn't grow up with, say, the Windows interface or, as someone mentioned earlier, a telephone interface where you have to press send to make a call, it's an even more basic issue. They grew up in a world where machinery was expensive, fragile and dangerous and a world where adults seldom learned to operate fundamentally new machinery. Even sturdy, harmless household machinery wasn't safe to "play around" with. One reason you had to dial 1 to make a long distance call, even before exchanges and area codes overlapped, is to reduce the risk of misdialing or misunderstanding your way into a big bill. If you pick up the phone in the middle of the night and dial random numbers to figure out the numbering scheme and whether it takes longer to call cross-country, you'll get a big bill and, if you piss enough people off, get a visit from the police or a stern letter from the phone company. If you enter random URLs into your browser, you're unlikely to break anything. We (younger people) have an advantage in that we're used to pretty much everything being software driven, so we know that if we screw up our computer, phone or DVD player we can just pull the plug or the battery. We're also used to the idea that not every device will behave the same way to achieve the same function. We press "send" to "send" a call, but not to send an SMS message, even though the latter is standard usage and the former is not, but we don't care because we know that's how the UI works. And, we know that we'll have to keep learning new UIs as we get older. Older people don't have a problem dialing nine for an outside line, even though at home they just pick up the receiver, because they probably learned it in their 20s.