“…First, we take seriously the idea that many social movements must tend to intramovement divisions related to age, an attribute rarely considered in this literature (but see Cornfield 1989Cornfield , 2015Whittier 2018). Previous literature instead highlights the role of bridging organizations and bridge leaders in bridging intramovement divides and tensions related to race, national origin, social class, sex, gender identity, sexual orientation, religious identity, and other forms of social difference (e.g., Coley 2014;Coley et al 2020;Gawerc 2020;Isaac and Christiansen 2002;Mayer 2009;Robnett 1996;Snarr 2009). Our multistage mobilization model addresses the lack of attention to age-related divides by highlighting distinct roles of different age generations in historically and qualitatively distinct stages of mobilization.…”