The article explores the concept of baby boomers as a "crossover" generation, one that embodies characteristics of previous and later generations. The context is the retirement of the baby boomers and its potential impact on the public library. Ethnographic method within a constructivist framework was used, employing the techniques of focus groups and individual interviews. The findings focus on four principal areas: baby boomer characteristics; information needs and resource use; social needs; and the role of volunteering. Comparisons are made with other generations, as appropriate. The conclusion is that, despite some shared characteristics, differences require innovative responses from public libraries. (Contains 1 table.)