How much longer will my dog last for?

My dog is a 6-year old shih-tzu who's extremely healthy and has no health problems whatsoever. How long do these dogs usually live for?

UK Kennel Club survey puts the average life span of a Shih Tzu at 12 years 2 months with most living between 10-16 years.

If they are fixed, live indoors, and treated properly and fed well they can live fifteen years or more.

Dogs usually don't live much longer than 10 years. however you can possibly extend life by making sure they get the best nutrition. My older dog is now getting Dynovite supplement to extend his life and it has done so! Here is an article about it...http://www.associatedcontent.com/article/5586612/dinovite_dog_vitamin_supplement_saved.html?cat=5