Is a 26 year old female is too young to have colorectal cancer and to had a partial coloectomy done?

Could it possibly be a genetic for someone to have colon cancer and needs a partial coloectomy and they dont need no treatment at this time such as, radiation or chemotherapy? Will this young person to have normal bowels again? Do doctors really recommend the person to be on a special diet? Does that means they have to wear a bag through their skin?