Mid 20s. Luckily those are the only 2 folks who have had cancerish problems. My grandmothers stuff wasn't too bad, they just took out a section of the colon. My uncle had full blown cancer. Went in and got out all the polyps and other bad stuff. Was on chemo for a few months but is doing great now.
He had no idea until he went in to get a physical (works for a family business doing commercial refrigeration equipment. they always need someone with a class C license so they can have someone to drive the big rig if needed). At the test place they took a blood test for his class C. They said that he needed to go straight to the hospital, that his red blood count was extremely low and he was in danger of passing out at any time. Turns out he had been pooping it out, but nothing looked abnormal to him. He saw the same folks everyday so no one really noticed the subtle change in his color (getting paler).
I woulda sent you a PM, but figured the thread could use a bump. Polyps can be pretty serious stuff.