Varies... On average, 12 years of age is typical, but just this week I saw a little girl not quite yet 9 years old having lost all of her baby teeth already, and in the past I have had patients as old as 15 losing their last one. Having seen thousands of kids over the last 10 years I can honestly say that average is 12 and range of normal can be as wide as 8 to 15.
May vary. However, the typical age range is 11-13.
Generally 12. Generally 12yo but I am seeing a variance of +- 1.5 to two years.
Primary teeth. Primary teeth are usually all lost by the age of twelve , but this can vary. See:http://www.Ada.Org/sections/scienceandresearch/pdfs/patient_56.Pdf.