The same overwhelmingly applies to driving as well, all other things being equal experience is ALWAYS the single greatest factor in number and severity of user-error related problems. That's why a minimum biking or raising the minimum driving age will do exactly dick for accident rates, it just means people will be just as inexperienced later.

What we really need are good bike-safety classes like I had as an elementary schooler, only instead of falling-to-pieces bikes and a few rides around an empty lot it needs to be more like drivers ed.