How young were you when you started investing?

I didn’t start until i was 35 i’m 45 now. I have done ok nothing life changing. I also manage my risk. My kid is really interested in it. Because of me probably. He is 14. He is a smart kid also an entrepreneur, like he buys bottled water and sells it at our local park. He has got like 4k saved up. He wants to try his luck on the market. He is doing research and coming up with thesis and just trying to figure it all out. Should I start a robinhood account or something and see?