Like the old song says: "Enjoy yourself it's later than you think." No doubt, individuals who are happy with themselves and their bodies will live longer than those who are depressed.
Of course, our bodies have to be looked after. How many junk food fanatics/smokers live past 90? Also, do you have a meaningful purpose in life past 65? Do you simply want to go on a permanent vacation and relax? Remember death is nature's way of telling you to slow down. It's also a change of environment and remember a "change is as good as a rest."
What about "meat and potatoes people" or "couch potatoes"? Not many of them make it past 90 either. Certain habits have to change. Fruits, vegetables and exercise serve a purpose in the human condition. "If you don't use it, you lose it?" That includes the human brain.
Don't take yourself to seriously. Not everyone is the same and we should tolerate differences in others, even extreme differences.
Have a healthy/fun life. Don't worry about what others think of you.