ryanthered

For relative visual comparison: https://www.apple.com/iphone/compare/?device1=iphoneSE&devic...

They do have an excellent grasp of their market, but their largest demographic for iPhones are males over 25, not female teenagers. Even so, I'm sure they did plenty of UX research with a large diversity of users in order to come up with the ideal screen size and repeated this with the iPhone 5.