Its possible for anyone to make money if they do it right, no matter the age. However, your blog content has to be well written, interesting and enjoyable in order to get readers. As for monetizing it (getting paid for what you do), you'll need a parent or guardian to do all of the agreements, acceptance of payments, etc., as these require you to be of contractual consent age, which is over 18.
22. Advertising – This is definitely the most old-school way of earning money with a blog. It’s also starting to become the least common way. You can sell advertising spots directly on your site or you can sign up with a company like Google AdSense or Media.net. Either way, you won’t see a whole lot of money from ads until your views are well into the thousands each day.