Above there are a lot of misinformation. This is how it is.
At 15 years of age you can get something called a learners permit, which allows young people to drive 110 cc motorbike or less.
At 18 years of age you can get a real motorbike license that let´s you drive any motorbike as it is today. Talks have been made that they should make a specific license for bikes over 250 or 300 cc, but that idea has stranded.
So, in reality, we do not know if the driver of the motorbike had a license, nor if he drove a legal size of motorbike.