I just want to chime in here with another J-pouch success story (since they seem to be few and far in between).
I was 53yo when I had my surgeries (long time UC sufferer) and I remember when I had my temporary ostomy bag that it wasn't so bad. In fact, it was kinda convenient at times. It really didn't hamper my quality of life and I was still able to lead an active life (hiking, SCUBA diving, wakeboarding, etc). I was so concerned about possible complications during the J-pouch surgery that I told my surgeon that I was thinking about not going forward with the J-pouch. He bluntly told me it would be a mistake to keep the bag and not proceed with the J-pouch. He reasoning was that I was young, in good health, and basically a good candidate for the pouch construction. I'm so glad I went forward with the pouch. Next week I turn 61 and going forward with the pouch has been one of my best life decisions (knocking on wood). I eat normally, no diet restrictions, no meds, and have roughly 4-5 BM/day. Initially, post surgery, there were issues with severe rectal irritation (I remember literally banging my head against the bathroom wall to divert the pain), but that was eventually resolved with ointments, a bidet, and time. Only issues so far have been two partial blockages, one last year and one a couple of months ago. I just need to keep hydrated and remember to chew my food really well. For those on the fence about having the surgery...my vote is definitely go for it.