I have had the same email address for 18 years, but I'm a dying breed. Most people I know change email address pretty regularly - as in more than once a year.
- Many people never abandon their primary identity email.
- But many other people often abandon their email identity.
- You don't want to use a social network as the gatekeeper to *your* site.
- You don't want to have human support for password resets.
Sekrit questions/answers along the lines of your first car's maiden name? Those can be forgotten just as easily as usernames for login.Also, to the extent to which this becomes important, it only becomes important too late, as in after you've already used an address or two. I have had the same address now since 1997 when I registered saurik.com, but I did that because I had in the two years prior "learned the hard lesson" that my ISP-provided e-mail address was doomed to be something I'd end up having to move off of, potentially fairly often.