What's the longest a Chihuahua has lived for?

I'm curious to know, what is the longest lifespan recorded for a Chihuahua dog breed? Have there been any notable cases of Chihuahua's exceeding the average lifespan, and if so, what might have contributed to their longevity? I'm fascinated by the various factors that can influence a pet's lifespan, and I'm particularly interested in learning about the Chihuahua's potential longevity.