Except for a very few conditions, genetics as a predictor of your medical future is just about useless. For example, your genetics could place you as having a high risk of heart disease—but you live a healthy lifestyle, eat well and exercise regularly, and never develop heart disease. The intersection of genetics and environment is far too complicated to be revealed by a DNA test.
On the other hand, it is fascinating to know about one’s ethnic background. My genetic analysis shows that I am mostly of Anglo heritage, but I also have Scandanavian, Asian, and African heritage. Amazing! My oral family history does not include Asians or Africans!
If you eat right, don't drink or smoke and get plenty of rest and exercise, you get eight more years in an old folks home.