I got my account a few years ago because of that "Under 13" thing, can I change the e-mail to my e-mail?
Yes if you log in to your account you should see a row on the left side with: 'Your user name' 'Profile overview' 'Pgl settings' 'Pokémon TCG online settings' 'Play! Pokémon settings' If you click the 'profile overview' tag you should get a new page with all your profile info. Underneath 'user name' there will be a box with your current e-mailadress. You can delete what is written there and typ your new e-mail adress. Then click the 'save' button on the bottom of the page. Hope this helps.