Agree with CT.
I've had my J pouch since age 19 (I'm 43 now). My function overall is very good, and I'm continent.
I'm also an ICU nurse, and I imagine something else will get me before my pouch does.
Figure if things get tough in my elder years, I'll just have an ostomy formed, and let the pouch lie dormant, as long as it's not in bad shape.