Colon Cancer Support Group
Colorectal cancer, also called colon cancer or bowel cancer, includes cancerous growths in the colon, rectum and appendix. Many colorectal cancers are thought to arise from mushroom-like growths that are usually benign, but some may develop into cancer over time. The majority of the time, the diagnosis of localized colon cancer is through colonoscopy.
There is an age gap between your dad and I but I would think if the oncologist is recommending the chemo, he probably believes he can survive it and have a good quality of life. I was 35 when my whirlwind hit me. And to this day I live my life differently. But I am active and have a full life. I hope the same for your dad.
I know they say to stay away from online research,... but I don't agree. Just make sure you get a well rounded amount of knowledge from reliable sources. I was lucky that one of my sisters (also a survivor) was very good at researching the medicines at the time.
I hope this is helpful to you.