Technology is pretty difficult to keep up with. If you think it's hard to get used to a slightly different version of an iPhone, try to imagine how people who didn't even grow up with cell phones must feel.
While there's always that one person in the family who has to have the newest technology for everything, it's usually the older generations who are more resistant. For some of us it's difficult to imagine a world where you couldn't send a hyper-speed message to a friend in another country or order a cab or dinner from your phone. However, older generations lived for decades without cell phones or the internet. They had to write their school papers referencing only books--no procrastinating the night before with Wikipedia references at 4 AM. Sorry, all my high school teachers.