Nina Pasini Deibler
I got my iPhone when my daughter was 3. She picked it up and immediately started using it the first day. When she turned 4 we bought her her own iPod Touch so I could have my iPhone back. She uses it for learning games and to watch Dora, etc. When my parents (in their 60s) saw her using it, they decided to get iPhones too. I think that's a testimony for how easy it is to use.