Just to get my beef out of the way, I think there's more hand-wringing and hand holding than militancy in this book. As a worker sliding into the age "cohort" in question, I don't feel empowered by this text.
1. The cover and title set up certain expectations for the content that are not fulfilled; what if any relevance does a New Deal image have for Riggs's message? Is the woman on the cover over 55? Is she a granny? How does skilled machinist work compare to the amorphous tech work of today?
2. In ch. 7 Riggs discusses the images of seniors/elders in advertising, and observes that products marketed to affluent retirees are not making it with seniors in general. Are advertisers really trying to sell to an age group, or are they trying to sell to people who have money to spend?
3. PP. 181-182: isn't there a distinction to be made between Riggs's matures (pre-boomers) and Tom Brokaw's "greatest generation" (born before the 1929 crash, like my parents)? What are the differences in the ethos of those old enough to have been born in prosperity but to have experienced the Depression (before 1937-8) and late Depression/WWII children? Note that 1944-1954 was on balance a reactionary period in American history.
4. One more: where is the work in Granny@work?