Oh, I thought it was because they're a way to show off about being rich.
> We require age minimums for driving, voting, and drinking because we believe maturity only comes through lived experience.
Even if she could reach the pedals, my 4yo doesn't have the attention span to drive. This isn't a "lived experience" thing, it's a physical brain development thing. IIRC the are effects with learning math, where starting earlier had limited impact on being able to move to certain more advanced topics earlier; ie there's more going on than just hours of experience.
The standard age for voting is also the age for being a legal adult. There are sound logical reasons that these ages should match.
The standard drinking age is due to pressure by activists, and AIUI is lower in other countries.