Your mind may be the closest thing to the Holy Grail of longevity and happiness. Education has been widely documented by researchers as the single variable tied most directly to improved health and longevity. And when people are intensely engaged in doing and learning new things, their well-being and happiness can blossom.
This effect becomes even more valuable as we get older. Even in old age, it turns out, our brains have more plasticity to adapt and help us than was once thought. Old dogs, in short, can learn a lot of new tricks.