It does when calculating your 10-year-risk, but not for lifetime risk. I'd like to add a feature to show you both 10-year and lifetime risks, but for now, the NIH has a 10-year-risk calculator: http://cvdrisk.nhlbi.nih.gov/

For most people, the 10-year-risk becomes important in your 50's, 60's, and 70's and is used to guide treatment for e.g., statin therapy or anti-hypertensive medication.

If you're 30, your 10-year-risk is generally very low even if you treat your body terribly. :) So part of the motivation for showing the lifetime risk is to get people thinking about how to optimize their health for their life, since by the time your 10-year-risk is significant it's often too late to change your habits for diet/exercise.