““Every idea in this book runs against our natural tendency to want to relax, take it easy, reward ourselves for decades of work and childrearing. Our default mode at midlife is entropy. The default is not destiny, and on this, the research is unequivocal: for every fork in the road, you are almost invariably better off making the harder choice. Harder in the moment, that is, but easier over the years, as your body and mind remain strong. By resisting entropy, but pushing through the inertia the beckons us to rest a little longer, to slow down just a notch, until your life has narrowed to a pinprick – by resisting those forces, you dramatically up the odds that your life will be rich to your final breath, deeply entwined with family and friends, engaged in intellectual pursuits, and infused with a purpose that extends beyond yourself. Yes, it's hard. Yes, it's worth it.””