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Abstract ObjectivesWe estimate adult age frequencies from Unar 1 and Unar 2, two late Umm an‐Nar (2400–2100 BCE) tombs in the modern‐day Emirate of Ras al‐Khaimah, United Arab Emirates. These collective tombs each contained hundreds of skeletons in commingled, fragmented, and variably cremated states. Previous studies placed the vast majority of this mortuary community in a generalized “adult” category, as have most analyses of similar tombs from this period. We sought to test how adult age estimation methods compare in identifying young, middle, and old‐age individuals in commingled assemblages. Materials and MethodsWe employed Transition Analysis 3 (TA3) and traditional age estimation methods to generate adult age frequencies for each tomb. We compared these frequencies between tomb contexts as well as by method. ResultsUnar 1 and Unar 2 had similar adult age frequencies within each method, but TA3 age frequencies included significantly more middle and older adult individuals than those generated by traditional methods. DiscussionThese results support findings of earlier iterations of transition analysis in regard to sensitivity in old adult age estimation, compared with traditional methods. Our findings indicate a potential use of TA3 in reconstructing age frequencies and mortality profiles in commingled skeletal assemblages. Increasing our understanding of everyday life in the distant past necessitates better understandings of adult age, and here, we illustrate how age estimation method choice significantly changes bioarchaeological interpretations of aging in Bronze Age Arabia. Research HighlightsAdult age estimation using TA3 revealed significantly more middle and older adults than traditional methods in two commingled tombs.Similar mean maximum likelihood point estimates by side and across skeletal elements were found between tombs.