I'm very close to 79 and never have done a colonoscopy. They have been around for about 20 yrs and I was about 59 when they got so popular. None of the doctors I saw, and I don't see many, never brought the subject up.
I'm in a discussion on another group about colonoscopies and MOST who chime in get them, there are about 6 or so of us who do NOT. And anyway, after 70 they are not recommended, and I don't get mamms and I hear the same about prostate screenings for the males.
There is a long thread on mag here and I don't know if this is mentioned in it, and if it is, it's buried. Most days I take 400mg mag citrate or a complex and often take more, I spread thru the day.
Could be my colon likes magnesium and is thanking me. I'm keeping it cleaned out.
Magnesium reduces the risk of colon and pancreatic cancers in latest studies - NaturalNews.com
And as always do your research.