Intergenerational storytelling (IGS) has recently emerged as an arts- and humanities-focused approach to aging research. Despite growing appeal and applications, however, IGS methods, practices, and foundational concepts remain indistinct. In response to such heterogeneity, our objective was to comprehensively describe the state of IGS in aging research and assess the critical (e.g., conceptual, ethical, and social justice) issues raised by its current practice. Six databases (PsycINFO, MEDLINE, PubMed, Scopus, AgeLine, and Sociological Abstracts) were searched using search terms relating to age, intergenerational, story, and storytelling. Peer-reviewed, English-language studies conducted with participants residing in non-clinical settings were included. One thousand one hundred six (1106) studies were initially retrieved; 70 underwent full review, and 26 fulfilled all inclusion criteria. Most studies characterized IGS as a practice involving older adults (> 50 years old) and conventionally-aged postsecondary/college students (17–19 years old). Typical methodologies included oral and, in more recent literature, digital storytelling. Critical issues included inconsistently reported participant data, vast variations in study design and methods, undefined key concepts, including younger vs. older cohorts, generation, storytelling, and whether IGS comprised an intentional research method or a retrospective outcome. While IGS holds promise as an emerging field of arts- and humanities-based aging research, current limitations include a lack of shared data profiles and comparable study designs, limited cross-cultural representation, and insufficiently intersectional analysis of widespread IGS practices. To encourage more robust standards for future study design, data collection, and researcher reflexivity, we propose seven evidence-based recommendations for evolving IGS as a humanities-based approach to research in aging and intergenerational relations.