Job. You can't be successful in cryptocurrency world when you are in need of the money. Think about it: The market rises and sinks every days. Are you willing to sell your coins in a low price period because you need the money to pay your rent?
Read again what I said. The kid invested $1000 and was successful years later. If the kid were an adult and had no job, he would have sold his BTC at a price of $600 or even lower when he is in need of the money.