01 February 2009 iZac
20-39 _Generation X and Generation Y
40-59 _Baby Boomers
The newer generation characterisation relies not so heavily on random age demographics, but rather characteristics of each segment. iGeneration, most specifically, focuses on interweb usage and have been named aptly so because they have no memory without it.
Two things to note…
+ The next generation now has an official name, at least here in Australia.
+ I can no longer call myself a Gen Y, instead I am an iGen. Scary.