Google AdSense Help · support.google.com
FreeBeginner
Google's own conditions for showing AdSense ads on a blog: your own original content that meets AdSense programme policies, and you must be 18 or over. It explains hosted accounts for Blogger users.
You need original, high-quality content that meets AdSense policies.
Applicants must be at least 18 years old.
Blogger users can sign up through a hosted AdSense account.