When I was 12, I built apps to automate MMOs. I was making about $350/mo. from AdSense - not bad money for a kid my age - when my account was shut down on the last day of the billing cycle (ie., the day before they were going to send me a check).

After some initial disappointment I changed to a subscription model, which increased my profit by an order of magnitude and incentivized me to work a lot harder on creating a quality product. Because of this, I don't regard my AdSense shutdown as a bad thing. Knowing nothing about the sort of apps you make, I'd encourage you to try to explore more options to monetize them. Clearly a number of people were using your apps. A different approach to monetization may be just as thrilling and rewarding.