Chihuahuas can live between 15-20 years if properly cared for. Factors that impact their lifespan include diet, weight, healthcare, genetics, spaying/neutering, vaccinations, oral care, gender, and activity levels. Small breeds like Chihuahuas tend to live longer than medium-to-large breeds. The world's oldest recorded Chihuahua, Megabyte, lived to be 20 years and 265 days old. Reports of Chihuahuas living up to 22 years have not been verified. Owners should focus on providing a nutritious diet, routine healthcare, and regular exercise to promote a long and healthy life for their furry friends.