The first thing I'd do if I had $20 at twelve
Most money advice for kids is condescending. Here's the version I wish someone had told me at the start of middle school.
When adults talk about money to twelve-year-olds, they usually pick one of two tones: condescending or terrifying. Either it's “don't spend your allowance on candy!” or “compound interest will save your life.” Both miss the point.
I learned this the hard way. For years my entire money system was a piggy bank, and I had zero patience. Every time it got even a little heavy I'd dump it out and spend all of it at once on whatever was in front of me. Then the thing I actually wanted, the big one, would finally come along, I'd count what I had left, and it was basically nothing. Every single time.
The real first lesson is much smaller than taxes or investing: figure out what your money does when you're not looking at it.
1. Open one real account.
Not a piggy bank. An actual savings account at a real bank, even if it has $5 in it. Ask a parent to help. The moment you have an account with your name on it, money stops feeling like Monopoly and starts feeling like yours.
2. Track three things for a month.
Pick three categories, like food, gifts, and “random stuff I impulse-bought.” Write down every dollar. After a month you'll see one category quietly eating most of your money. Cutting that one category in half is the easiest “raise” you'll ever give yourself.
3. Set one goal you can actually hit.
Not “save $1000.” Try “save $25 by the end of the month for X.” Big abstract goals are how adults convince themselves to give up. Small specific goals are how you build the muscle of actually saving.
You don't need a Roth IRA at twelve. You need the habit of watching, tracking, and choosing on purpose. That's the first thing. Everything else builds on top of it.