Almost every piece of text on my sites is within some kind of div.  There's nothing wrong with using divs at all!

However, if you were trying to hide the text within a div for manipulative purposes then this would be against Google TOS.

My thought here is that this is a causation vs correlation issue.  I don't believe that registering a domain for more than a year will have any effect on SEO.

However, if you look at well established websites, they are more likely to have their domain names registered for a longer period of time.  A well established website is more likely to be well managed and to have accumulated worthy backlinks.  As such, the well established site is going to rank better in the SERPS.  But this increase in ranking is not because the domain name is registered for more than a year.

See what I'm saying?