Since last 5 years, kiddos under 13-17yrs & grand paa’s have showed immense interest towards iPhone, if you look into the case study of comscore you can see the changes in the age group 13-17 & 55-65+ 🙂
Screen Shot 2012 07 01 at 1.24.42 PM Kiddos & grand paas have showed interest towards iPhone in last 5 years

Also, iPhone have helped a lot in revolutionize the smartphone usage. It is increased from 9 Million Americans to 110 million now.