I'm not sure about the over 50 crowd, but given that colorectal cancer rates rose 64% in people under 40 in the last 10 years surely you should be looking for an ambassador to reach this important, and often forgotten, group? I have colorectal cancer at 29, and have since met a stack of other 20- and 30-somethings with the disease. We're all young and good looking - does your ambassador need to be famous? (Joke)