Well, I'm 20 years old, and before when I first got diagnosed, I was put on prednisone, pentasa, 6mp, and a couple other medications.
Finally, I was just on 6mp, but it made me SO tired. One day I dumped all my medication down the tiolet, notified my doctor, and was ok for about 2 years. I felt GREAT! But...Currently, I'm having a flare up, and have an appt with my doctor on the 3rd, which he will probably want me to be on medication again.
So, an answer to your question...
I guess a person can go without medication...it just varies how long it may be before you have another flare up, depending on your lifestyle. I think a lot of hours at my job triggered it.. it was a lot of physical work. It all depends on what feels right for you, but if you have any signs of flaring, your body is trying to tell you that you can't do it on its own anymore.
Hope I helped!