Shih Tzus typically live between 10 to 16 years , with many healthy individuals reaching well into their teens and some even living up to 18 years or longer

. The breed's small size contributes to their relatively long lifespan compared to larger dogs. There are exceptional cases of Shih Tzus living much longer, such as a dog named Smokey from Florida who reportedly lived to 23 years old

. Factors that influence their lifespan include genetics, diet, exercise, routine veterinary care, and maintaining a healthy weight. Proper grooming and attention to common health issues like dental problems and brachycephalic (short-nosed) complications can also help prolong their life

. In summary, with good care, a Shih Tzu can be expected to live around 10 to 16 years, often providing a long and loving companionship.