Here's a good article from the Los Angeles Times dated May 10th, and reprinted on the AEF web site.
A few people quoted include Brad Adgate of Horizon Media, a top media planning (and more) firm. Mr. Adgate is a 'go-to' guy for lots of news outlets, including NPR. Do a google news search for "Brad Adgate" some time and more than likely you'll find a quote or quotes from him. From what he says about Baby Boomers, I'm guessing you'll get a sympathetic and knowledgable ear at Horizon Media if interested in targeting this demographic.
Brent Green penned Marketing to Leading-Edge Baby Boomers, and Matt Thornhill runs the marketing and research firm The Boomer Project.
The Advertising Education Foundation, among many other things, is the best place to hunt down advertising articles from The New York Times and other periodicals - ones which may have vanished into the pricey ether. For example, here's an excellent NYT piece from December 2003.