My advice for that? Work hard to learn how the market works and show them you're serious about it.
I'm 13 and almost 14 and I'm pretty interested in stocks. I have a lot ive got as gifts and have been watching and even researched some. One if them was tesla motors which started at 20 and is now near 250 in a year. I want to know if there is another way I could get stocks. I know I need to wait until 18 until I can do it myself. I know I'm young