Lichenometry is a critical tool for the reconstruction of environmental history and hazard assessment, particularly in mountainous regions. However, scientometrics insights into the evolution, thematic structure, and methodological practices of lichenometry research remain limited. The present study is the first integrated scientometrics synthesis of global lichenometry research, systematically analyzing 357 peer-reviewed documents retrieved from Scopus database. The research predominantly emphasizes glaciology, plant ecology, geomorphology, seismology, and hydrology. In glaciology, primary study is related to glacier retreat, paleoclimatology, debris flow activity, lichenometric dating of late Holocene moraines and glacial features, as well as the studies of the cryosphere dynamics and permafrost. Plant ecology research includes dendrochronology, lichen ecology, paleoclimatology, alpine climate change, and the analysis of tree growth rings to establish chronological timelines. Geomorphology research pertains to dating lava flows, inferring rockfall frequency and lichenometric dating of rock surfaces, surface dating, and aeolian soil erosion within higher Himalayan landslide zones. Hydrological studies address paleo-floods, paleohydrology, flood dynamics, and hydrometeorology, while seismology focuses on determining the ages of earthquakes and historical earthquake events. Topic modelling using Latent Dirichlet Allocation (LDA), identified dominant research themes and observed a recent transition from traditional dating applications towards climate and hazard-oriented research. By integrating content analysis with Mann-Kendall trend (MKT) test and Sen's slope and bibliometric approaches, this study provides a novel data driven framework. This framework will be useful for evaluating the development and future directions of lichenometry research. Keywords: Cryosphere science; Climate change; Geomorphology; Himalaya; Lichenometric dating; Paleoclimatology; Systematic review; Bibliometrics synthesis; Global assessment.