1. Eat A Healthy Balanced Diet
What you eat is of first importance in regard to how healthy you will be and how long you can expect to live. If you eat a lot of refined, processed and sugary foods your health will suffer as a result of this.
Instead eat mostly natural whole foods, specifically meat, fish and eggs (your protein sources), whole grains, potatoes and sweet potatoes (carbohydrates), healthy fats (such as olive oil and coconut oil, but you'll also get these from oily fish, nuts, seeds, avocados etc.) plenty of vegetables, and some fruit, beans and dairy.