<<Disclaimer: Verify this information before applying it to your situation.>> I can't believe the number of responses I got to my inquiry on how long it would take for a 60 year old man to return his bowell habits to normal. Generally, the responses boiled down to the following: 1. Accidental ingestion of Gluten. (listerine, licking envelopes, balsalmic vinegar mixed with grain vinegar, eating out, etc. 2. It can take anywhere from a couple of months to several years, or never, for his bowells to return to "normal". 3. Going 60 yeras without diagnosis can substantially increase the length of time it takes to heal. Again, thanks to a wonderful bunch of people.