If you are looking for web sites and news about or by boomers, Alltop is a great place to start.
From my quick scan, there are 78 listed currently. No shortage of reading!
There is a wide variety of topics. If you are thinking of starting a blog on a particular topic about boomers, it would make sense to have a look through the list on Alltop, just to see what is there already.
Not that you shouldn’t start a site if someone else has already started writing on your topic. If you have special expertise or a particular angle – and don’t we all, in one way or another? – don’t be put off by the fact that someone is writing about something similar.