Shih Tzus generally have a long lifespan for a dog breed, typically living between 10 to 16 years , with an average around 13 to 14 years. Some sources extend this range slightly, citing lifespans up to 18 years or more in exceptional cases. The oldest recorded Shih Tzu reportedly lived to 23 years of age

. Their longevity is attributed largely to their small size, as smaller dog breeds tend to live longer than larger ones. Female Shih Tzus may live about 1.5 years longer on average than males

. Factors influencing their lifespan include genetics, nutrition, general care, and living environment. Proper diet, regular veterinary care, and attention to breed-specific health issues like respiratory conditions can help maximize their lifespan

. In summary, you can expect a Shih Tzu to live roughly 10 to 16 years , with many living into their early to mid-teens under good care.