A review of human studies indicates the miR-1538 is an age-related miRNA, with its expression significantly reduced in peripheral blood mononuclear cells from older individuals [Silva et al. DOI:10.1016/J.Fsigen.2014.09.002]. Further research in humans confirms the miR-1538 is significantly reduced in older adults, supporting its role as a biomarker for age estimation [Song et al. DOI:10.1007/s00414-023-03091-1].