I understand where you are coming from, and it makes 100% sense if you own a PC/laptop as well. But guess what? In a lot of places the majority of population (including younger people) do NOT have them. Their first and only experience of computers is a mobile phone. Even though "teenagers who care about computers" is a low number, now a lot of them won't realize that something like a general purpose computer exists (until way later, if they end up using a computer at work).
I grew up being fascinated with how useful and flexible computers are and fell in love with creating software. I'm quite sure that I would not have happened if I was born during the last 10 years.