Clinical translation of salivary MicroAge for understanding the oral-systemic connection in healthy longevity.

The oral-systemic connection, salivary microbiome, and healthy longevity are increasingly recognized as biologically interconnected. This review summarizes lifespan changes in the salivary microbiome, its links to age-related systemic diseases, and recent progress in salivary MicroAge modeling. It further highlights advances in data preprocessing, feature engineering, and artificial intelligence-based prediction, while emphasizing the importance of standardization, generalizability, and biological interpretability for clinical translation. Overall, salivary MicroAge may provide a noninvasive and interpretable framework for biological aging assessment and healthier aging.