Notch is the creator of Minecraft, as well as its former lead developer. He was the Lead Developer for a long time, until on December 2, 2011 when he stepped down and gave developer Jeb the title of Lead Developer. Notch stated that he will not work on Minecraft any longer as he is testing his new coding skills on making different games. Notch later left Mojang after it was acquired by Microsoft.
There are a lot of places to get great maps. Here are a few to get you started though.
Minecraft has been rated as suitable for 7+ by PEGI, and for 10+ by ESRB. iTunes has a 4+ rating for their Pocket Edition. Developers Mojang don’t allow anyone under the age of 13 to set up an account meaning any new purchase will have to go through a parent.