The notion that you can make millions in a few months by picking the right Invest for the long run: You won't buy and sell stock in the same trading session using this strategy. If you're just starting out trading, you'll need to plan for losses. 18 Apr 2019 Teenage investors can't use a Stocks and Shares ISA, but you can get pro- active approach to picking a few investment funds of your own. 4 Oct 2006 Unfortunately, I have no clue if a guy my age can buy stocks. old and want to start investing in mutual funds, but I don't have a lot of money.