Loads of companies out there will not take them on if a certain age some as low as 7 years old.
And?
Some car insurance companies don't take you on if you are under a certain age. Others don't like you if you are over a certain age. Or not English, or European, or male.
Just pick a company that does want your business, there are hundreds of them around. And the weirdest thing is, that those companies that have the most exemptions are sometimes dearer than those who will take on everyone.