Heat aging stability is a hallmark of EPDM rubber and a requirement for the application of rubber hoses, sealing strips, roofing membranes, and other rubber products. This paper derives a model for predicting the service life of products at actual application temperatures by testing the tensile properties of EPDM vulcanized rubber after aging at temperatures of 100°C, 120°C, 130°C, and 150°C. The test results indicate that peroxide-vulcanized EPDM rubber exhibits higher strength and lower elongation at break compared to sulfur-vulcanized samples. After aging, the tensile strength initially shows a sharp decrease, and as the aging time increases, the decrease gradually flattens out. The elongation at break shows a higher and continuous loss, and the higher the aging temperature, the more severe the loss of strength and elongation at break. Both vulcanized rubber samples exhibit the same pattern of physical property loss. Based on the established aging model, it is inferred that a product using sulfur-vulcanized rubber can last for 17 years, while one using peroxide-vulcanized rubber can last for 44 years, providing strong evidence for the practical application of the product.