Depends on where you're at, and if you're OK with paying the fines or not.
Some places do have mandatory helmet laws, some have them for kids/teens. Other places, it's still free.
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Regardless of age, everyone is legally required to wear a helmet while biking. Depending on the country that you live in. UK for instanstance has no legal requirement to wear any sort of safety equipment on a bicycle.
Skateboarding Biking Hockey
you could, because they are essentially the same. But it would be very hot because of all the padding. But I've seen helmets where the padding just comes out and it can be used as a biking helmet like Helt-Pro. You can buy one helmet with winter hat, and some changeable summer hats and use it for biking)
It is legal to wear a crash helmet while driving a car.
Yes. Most of US states, require a rider to wear a helmet.
For a while he didn't have to, but then the NHL required the use of a helmet.
yes
A child should wear at all times their helmet; knee pads and elbow pads when they are on the skateboard. If the child resists then show them pictures of some of the famouseskateboarders while practicing because most of them do wear at least the helmet.
In Australia it is a national law that people of all ages have to wear a bicycle helmet while they are on theirs bikes.
It might be. The laws are different in different states and countries, but, it probably be a SMART and good idea to wear a helmet on horseback.
Always wear a helmet while you are ridding.