To begin, you should take the following into consideration:

1. Healthy Eating - You are not going to live a long and healthy life if you eat only junk food that is full of fat. You should aim for 6 serves of fruit and vegetables as well as 6 serves of grain a day. Red meat is also good, but you should not eat to much as some red meat can also he high in fat.
2.Regular Exercise - You need to improve your fitness to reduce your risk of cardiovascular disease (especially if you are already overweight.) Exercise can also make you happy because it stimulates the production of the hormone serotonin which makes you happy.
3. Do all you can to prevent illness - Make sure you get enough sleep each night, as well as taking a multivitamin to boost your immune system. Regularly getting sick is a sure fire way to ensure you do not live as long as you can.
4. Avoid stress, smoking and drinking - Three sure things to shorten your life span are excess alcohol consumption, smoking and being highly stressed. That said, small amounts of alcohol can be beneficial (especially red wine) however excess consumption can cause a multitude of medical problems. Managed stress is fine but too much stress in your life can cause your heart rate to overwork and cause your immune system to decrease. Stress can also lead you to indulge in negative habits like drinking and smoking in an attempt to lower your stress levels. If this happens to you, do something else immediately to break your pattern.

If you take in to account the four tips mentioned above, you would be well on your way to living a longer, happier and healthier life. Remember it is not difficult to have a long, happy and healthy life. You just to put the right strategies into your own life consistently.