Welcome , I was diagnosed with Crohn's after my first colonoscopy at the age of 55. I was bascially asymptomatic at the time and have been ever since. They found a real mess, immediately hospitalized me and did more tests before the diagnosis. Another GI and surgeon were called in during the colonoscopy and their first thought was cancer. I believe that I had Crohns for many years in the form of inflammation that healed itself as scar tissue. Many referrals and tests later I have had a resection of the colon in May 2009. I am having my first colonoscopy since then on Tuesday. We will see what is going on in there.
So yes you can have severe Crohn's with no symptoms. And yes it is hard to make decisions regarding meds or surgery when you are feeling so good. I do question the ability to heal scar tissue but it may not cause any problems for quite some time?
I doctor in Calgary and good luck to you.