Your case of curiosity is a very very specific one, and while most people are curious in different ways, for those who are curious in the same way as you, anyone with an Apple device and an Apple computer can sit down and start tinkering with code and running stuff on their own iOS devices, it’s fun and pretty easy to get started. If I was just a child or a teenager today, I think I’d have just as much fun, probably a whole lot more, playing around with iOS and learning how it works and building really interesting applications using its extraordinary range of technologies, things that were never possible in the old days of tinkering.