..your life span.
Centenarians around the world come from many different backgrounds and professions, but one of the most common hobbies among them is gardening. As exercise, gardening strengthens the muscles, as a discipline it requires patience and cultivates fortitude and in the end it brings rewards and joy to its practitioners. Studies show that gardeners have lower incidence of heart disease and osteoporosis than non-gardeners.
from: Secrets of Longevity