The lead in Bloomberg's report on Google+ new age requirements is a good example of a typical lead, and a well-structured one.
The lead does not include a specific time element, but gets straight to the action of the story: That Google has widened its age restrictions to allow children 13 or older to join it's social networking site, Google+.
After taking care of the who and what, the Bloomberg lead gets into the specifics of the "why"; that Google is changing these policies in order to compete more easily with Facebook, which is also open to anyone 13 and over.
The Bloomberg article also takes care to mention Google's trading symbol, GOOG, in the lead (and also makes note of Google's stock later in the article). This would be too specific to note for most publications, but is appropriate here since Bloomberg mostly reports financial news.