Systematic efforts have been carried out to study ageism against older populations. Less is known about ageism against younger populations, including how it is defined, how it manifests, its effects, and how it can be addressed. A scoping review was conducted aimed at identifying available evidence on these topics. A comprehensive search strategy was used across thirteen databases, including PubMed, EMBASE, and CINAHL. Records were screened by two independent reviewers. Data extraction was done by one rater and independently reviewed by a second rater. Of the 9270 records identified, 263 were eligible for inclusion. Most of the evidence focused on the manifestation of ageism (86%), followed by a focus on the determinants of ageism (17%), available interventions to address ageism (9%), and the effects of ageism (5%). This study points to the inconsistent terminology used to describe ageism against younger populations and the relatively limited theoretical rationale that guides existing studies. It also highlights key research gaps and points to the strengths of existing research.
Keywords: ageism; discrimination; prejudice; scoping review; stereotype; youthism.