He's so young he may not have been screened properly. But a lot of people have difficulty affording to be screened.
There are different types of screening and Theranos was going to help society with some of it, but of course we all know how that went, and it probably set back advances in screening with technology.
Screening needs to become cheaper and more convenient. It's within YC's Request for Startups: https://www.ycombinator.com/rfs#healthcare