Not exactly what you're looking for but oh well. I'll just throw it out.
First modern device was an iPod touch 4th generation in middle school. (I had plenty fun with several year old Palm PDAs. Still keep some around)
Why? Everyone had iPod touches and occasionally an iPhone.
It was a matter of compatibility. Multiplayer games, being compatible with other people, it was THE platform. And I was missing quite a bit with Palm OS.
You'd be surprised, not everyone is 100 years old. As a Blackberry user I can't answer the question, and makes your comment relevant. lol
That out of the way, I'd also say app compatibility.
Even with young kids, I'd think their parents would get them something cheaper than an iPhone for their first mobile.
I have been on iPhones for years, originally it was because it was the only one that offered apps, quality touch screen etc then android came along and ripped it off....
So for years it's been iPhone, now considering windows phone when it hits 10. My reasons for iPhone now is primaraly security, I want to access the bank without my details hitting criminal websites (as happened to two of my kids when they used windows laptops for online banking). The appeal of windows is I like the os, there is also a much cheaper entry point, I mainly use email and calls so it's more than adequate.
I will need to be convinced it is secure enough and not yet researched that side of windows 10.
Are you winding me up?....You got that all sorts of backwards buddy. APPLE RIPPED OFF ANDROID>