Is it recommended to get a colonoscopy at age 43 if there is a family history of colon cancer? what other tests are needed at this age?

Yes...get one done: The age depends on your family, history. Screening mammography, a complete family history may add genetic testing. A complete physical.

10 years before diag: A basic guideline is that in the case of a potentially inherited cancer trait, that we start screening 10 years before the presentation of a first degree relative, i.e. Parent or sibling. If the relative was diagnosed with colon cancer at age 53, we consider beginning screening tests at 43. Otherwise begin screenings as age appropriate, colonoscopy age 50, mammo age 40.