The average lifespan of a domestic cat is typically between 12 to 15 years, although many can live into their late teens or even early twenties with proper care. Factors such as genetics, diet, and living conditions play a significant role in determining a cat's longevity. Indoor cats generally live longer than outdoor cats, often reaching 15 years or more, due to reduced risks from accidents, predators, and diseases. Regular veterinary check-ups, vaccinations, and a balanced diet can also contribute to a longer, healthier life for your feline companion.