My Apple I.D. uses an email address that is outdated. I have an iPad mini & a MacBook Air and don't seem able to change to updated address. Recommendations ?

Apple ID Support - http://www.apple.com/support/appleid/ -> Apple ID FAQ http://support.apple.com/kb/HE37 "How do I change my Apple ID Name or personal information? You can change your Apple ID Name at My Apple ID. Select your country and language, enter your desired changes, then click the Continue button. Changes take effect immediately. You can also use My Apple ID to change your personal information, such as your mailing address or email address. See How to change the name you use for your Apple ID if you'd like more information."