helmets for coaches in baseball all levels of play?

Yes. It wouldn’t hurt (!).

It will come in time.

As an aside, I always thought that people on sailboats should wear helmets to protect them from being hit by the boom. Now, I notice that the sailors on an America’s Cup boat are wearing helmets.

I think under 14

College, High School, MiLB, MLB. I’m not sure about under 14.