Libby it usally starts in younger to middle age, but your not alone.I run two support groups in Oregon and my local one are all mainly older folks. And there are quite few older people in my other group also. Have you had all the testing done by a doctor and have they told you IBS?This is just on D also for you and more common everyday causes to think about. http://www.aboutibs.org/Publications/chronicdiarrhea.html