Every investor wants the kind of stock you can buy and forget about. These are the kinds of stocks that will rack up giant returns over time as their competitive advantages accrue, much as the FANG group of stocks has over the last decade. They often operate in timeless businesses that are insulated from broader changes in technology or consumer tastes.If you're looking for stocks to deliver for your retirement or your kid's college fund, keep reading to see why our contributors recommend lululemon athletica (NASDAQ: LULU), Axon Enterprise (NASDAQ: AAXN), and Under Armour (NYSE: UA) (NYSE: UAA) to buy and hold for the next 50 years.Image source: Getty Images.Continue reading