Hi Jim,
In terms of ageism in the workplace, please see below for some references, including ones on age diversity climate (Boehm et al., 2014), age discrimination climate (Kunze et al., 2011), age discrimination (Marchiondo et al., in press), and age stereotypes (Marcus et al., 2016):
Boehm, S. A., Kunze, F., & Bruch, H. (2014). Spotlight on age diversity climate: The impact of age-inclusive HR practices on firm level outcomes. Personnel Psychology, 67, 667-704.
Kunze, F., Boehm, S. A., & Bruch, H. (2011). Age diversity, age discrimination climate and performance consequences - a cross organizational study. Journal of Organizational Behavior, 32, 264-290.
Marchiondo, L. A., Gonzales, E., & Ran, S. (in press). Development and validation of the workplace age discrimination scale. Journal of Business and Psychology. DOI: 10.1007/s10869-015-9425-6
Marcus, J., Fritzsche, B. A., Le, H., & Reeves, M. D. (2016). Development and validation of the work-related age-based stereotypes (WAS) scale. Journal of Managerial Psychology, 31, 989-1004.