Yes. All subscribers to the TraderDock Challenge must be 18 years of age at least.
Yes. Once you hit your targets while avoiding limits and trade at least 15 days during the subscription period, you will be assigned with a trading account from Positive Equity where you will begin trading to make real money with zero downside risk.
Given the risk they are taking with relatively inexperienced traders, Positive Equity have the right to switch traders from the simulation environment to the live trading environment at their discretion. Whether a trader is set to simulation or live trading environment, the important point is that once a trader passes the Challenge and moves to trading their Positive Equity account, all Net Profits earned from trading are payable to the trader subject only to the withdrawal rules on the account.