 Biological age prediction is an area of research that has seen significant advancements in recent years. Epigenetics, telomeres, transcriptomes, proteomes, metabolomes, and composite biomarkers are all being studied as potential indicators of biological age. While epigenetics has shown promise, more research is needed before it can be used as a reliable indicator of biological age. This article was authored by Julia Jiljada, Nancy L. Peterson, and Sarah Haag.