Google Adsense Minimum Requirements:
1. You should be older than 18 years to apply for Adsense. If you are smaller than 18 years than you could ask your Parents to apply on your behalf.
2. You should have a fully launched website. Google Adsense does not entertain Under Construction websites.
3. Your website should have a good amount of content. You should know that Google does not accept sites with very less contents.
4. A valid email address that works because you will be getting verification and confirmation email in that address
5. A bank account so that you can deposit the checks that you receive from Adsense.
6. Your blog/website must not contain illegal content, pornography and hate-related stuffs.
7. Your website or blog should be 6 months old. (Well, I know that Google is not quite strict on this requirement and if the Google Adsense Team finds that your website is good enough then they approve it even if it is 1-2 months old.)
