Some pets may live longer than others due to factors such as genetics, breed, diet, exercise, overall health care, and living environment. Genetics play a significant role in determining a pet's lifespan, as certain breeds are predisposed to specific health issues that may impact longevity. Additionally, providing a balanced diet, regular exercise, routine veterinary care, and a safe, stress-free living environment can all contribute to a pet's overall health and lifespan.