Is it possible to outgrow a gluten intolerance?

Not usually: Not usually, but check with a gastroenterologist for his opinion.

Unlikely : The problem with gluten intolerance is it's ability to cause minor symptoms that overlap with many other conditions not be recognized in it's lesser forms.The full blown celiac disease is likely an endpoint to those with the worst expression, but the diagnostic gut lesions improve on a gluten free diet only to return if re-introduced. Gluten can be avoided for life and still be a good one.