We only allow initial membership under "alumni status" of a college as long as you still retained the email ID of that college. While some colleges do allow their alumni to keep their college email ID, that may not always be the case.
The email ID has to be in working order as you will need to complete the account validation process by visiting an activation link sent to your inbox.
Existing CampusFlirts student members are able to convert their membership to alumni status automatically when they graduate.