You clearly ignored the reasons I gave, and you fail to consider how elections have consequences for beyond the what box someone checks. It's why personally I myself (and the Founding Fathers) are opposed to Democracy because no one can have all the information needed to make an informed decision on every election on every issue and candidate. How people vote has consequences for others. If it were up to me, there would be high standards to vote (not impossible, but if you think tests of religious faith are suitable to hold office or think impeachment is to remove someone from office you need to be educated about the system before you can make decisions about it) and even higher standards to run for office (most of what we have today would automatically be disqualified). The state isn't a game or a corporation, and consistently electing bad leaders has consistently lead to bad results abroad (especially in terms of how many places America has bombed and sent troops to).
When it comes to children, they are children. They need not be overly concerned about doing adult things.