...really young people can ride? I want to get one next year (the age is 14 here in switzerland) and want to know what they are called and the price for one new. They are the mopeds with pedals on them but still have a small engine
The Italians made a bunch of them. So they have names which do not come to mind. But a Yahoo search for moped will get you a long list. Here in the USA there is a few motorized bicycle conversions that work well, but you would need lower gears for Switzerland. Most are Chinese.
They cost here about $400 new and you can get the whole bike for $200 used. Try and find a bike with disc brakes because going is not their problem.