Maybe we will get those machines from the movie Elysium that cure any thing wrong with you in seconds! That or thermonuclear war in the next 50-100 years if not much sooner.
In all seriousness I think some of the biggest advances will come in or understanding of how the brain and mind work and how to treat/prevent cancer.
There's still got to be so much not understood about the brain and human mind.
It's kind of incredible how little we know about the brain.
In my pharmacology class I'm taking there are more than a few drugs that are described as "we're not completely sure how this works but we THINK it is because of xyz" kind of scary to think about haha.