Secrets Of a Longer & healthy LIFE

I think that the secret to a long and healthy life is happiness. I know from the past that if I was ever really upset for a long period of time, I would get sick.. but now that I've learned to just be happy everyday no matter what, I've never been healthier. My great grandparents are still alive, they've been together for probably 75 years or more.. I've never known two people who were more happy in my life. Of course, other things matter too.. but if two people who ate the same, drank the same, took the same vitamins and even exercised the same.. If two people with the same life habits had a contest, and one was always happy and one was always depressed.. I personally think the happy one would outlive the other.