>> "The age is relevant, because it is likely that his/hers resources are limited (and thus may have little to work with)."
I disagree with this point. When developing (relatively simple) apps the biggest resource is time - something a teenager has A LOT of. As someone who started developing apps when I was 17 I know that I was able to develop 5x the number of apps then that I can now. Simply because I had more time. Also because I was living with my parents as most people at that age are and money isn't really an issue it doesn't matter if apps fail, you can keep building. You don't need to spend time on paying projects or evaluate the risk of developing a new project of your own.
I know plenty of teenagers who, in 2014, cannot afford a computer. Some of those who have computers do not have internet access at home or at a nearby place. A lot of them have access to mobile phones, but those are not yet an option in terms of programming. This from personally helping kids and teenagers learn about computers.
You and I were lucky. And for that I'm grateful.
It does take time and skill to develop good apps. In this case, the company that provides that as a service is showcasing it through the app itself. In the case of the 15 year old, he/she is learning how to do so him/herself. I fail to see the issue surrounding this. They are both doing well.
Now, the OP took recent thread titles from HN and spinned it to its own benefit. That is good a good way to get attention on HN.