With the aging of the population, diseases of aging such as Alzheimer's disease, diabetes and coronary heart disease are gradually becoming a key concern in global health. Dietary polyphenols, as a natural antioxidant with biological activities such as anti-inflammatory, anti-glycation, and anticancer, can effectively prevent and treat these diseases through a variety of mechanisms. However, the current means of prevention and control for these age-related diseases are still insufficient, especially the lack of reviews and studies on systematic regulation from a dietary perspective. Therefore, in this paper, we will review the bioactivity of dietary polyphenols and their regulatory mechanisms on aging-related diseases, the relationship between dietary polyphenols and cell signaling pathways and the microbiome, and the creation of polyphenol-based functional anti-aging foods, so as to provide new ideas and methods for the intervention of geriatric diseases from the perspective of dietary regulation.