The author clearly does not slam everyone over 40.
She is absolutely correct about the liberal baby boomers, and unfortunately, those liberal baby boomers dominate academia, politics (in both parties), government bureacracies, and managerial/executive positions in just about every corporation in the country.
Conservative boomers have existed all along but they have been a minority all along. Some conservatives have done well by staying below the radar, or swimming upstream through the sewage, but liberals have run much of the country, and run it into the ground during the last few decades.
She speaks "mainly" of the Liberal Baby Boom Generation, but once she has said that, she goes on to blame everybody over 40 for everything that is wrong in the world today. I am wondering if she blames us because the stupid ideas the hippies had proved once again to be the opiate of the toddler. Sadly, but truly, Life consists of more than kicking and screaming "NO!", shoving everything you can reach into yhour mouth, and pulling down your pants in public.
Even Neal Boortz refers to us (the generation of whom he is a member) as "The Gimmee Generation" en masse, although it's a lot like blaming the whole preschool because three or four toddlers are ungovernable in a very public way.