Growing up, I had a credit union savings account, which expanded into a custodial investment account. It was a good learning experience - even though I wasn't deeply passionate about investing, I've had (and managed) a brokerage account for my entire adult life. It's something that adults should have, and I've since learned that many adults don't think about until much later.
- The money was mine. Half my allowance went straight to savings, and that was what that we opened the custodial account with. The investment account was not 'money you cannot have until you're 18' (i.e., a windfall) - it was 'money you are saving for a car, school, house, or retirement'.
- I was always in the loop about the account. I remember going to the brokerage in the beginning. Internet banking came along a little later (I think after I turned 18), and I got parental guidance on using the online tools to evaluate and choose funds.
- Also, since the money was mine (or 'mine'), there wasn't a lot of it. I just looked at those statements a few days ago, and was surprised. Enough to get started, but if I'd lost it or blown it, I could have made it up fairly quickly with a part-time job. In fact...
- Difficult to arrange, but: the market crashed right before I graduated, and took my investments with it. I would have lost money if I'd cashed out then, which was not cool. By the time it recovered, I was employed and adding to the stash.
- My parents budgeted for children's education expenses separately, and that money was theirs unless and until they chose to spend it. I would not have trusted 18-year-old-me with all the funds for my college education, and you probably shouldn't either.