I know that some young students who are prodigies have trouble getting all the knowledge they need. They want to be different so they need more knowledge than there fellow class mates or friends. Unfortunately on most of the important online course websites have age limit. My brother was angry when he wanted to do a course but he was under age. He said ,"Age limits are the lamest thing in the world." In old ages knowledge did not have an age limit, like the famous Leonardo da Vinci (my favorite) .
Leonardo di ser Piero da Vinci was an Italian Renaissance polymath: painter, sculptor, architect, musician, scientist, mathematician, engineer, inventor, anatomist, geologist, cartographer, botanist, and writer. He received this knowledge at an early age. He did not restrict himself to one topic. His knowledge was not confined. Leonardo received an informal education in Latin, geometry and mathematics. So that's how we youngsters should study. If we are studying sciences that doesn't mean we don't have to read about history or geography.
People shouldn't underestimate us youngsters, we are the real hope of the world and we will be the ones to change everything. There should be no restrictions to learning. We spend all our life learning so then why not in our early ages should we learn everything. Websites claim that they have put an age limit because they think we wont be able to handle it. It is our choice to start a course and it is our problem if we cant handle it. At least let the youngsters explore their own talents. Me and my brother love the history, astronomy, biology, chemistry, calculus, algebra and math course in Coursera. We may be young but we will take courses. The extents of the human brain have not been discovered and we aren't using our whole brain. Lets start using the whole brain. We were made for a purpose. We were made to explore the mysteries of the world. We must pursue our job.