I'd give strong votes to....
Smoking: proven link to cancer; education; cessation
Better nutrition awareness and participation
Cardio-vascular: regular work outs specific to it
Work outs in general: fitness centers, home, work
Better at the basics: more education to, and attention to more and better quality of sleep; meditation; better education and
.......periodic examination for breast and colon cancer
Media/the web attention to health..."tips for this or that;" new findings to assist longevity
Cancer: earlier detection, better therapy, dramatically more survivals
Enhanced medical modalities in general for diagnosis and treatment