—Melissa A., Yonkers, New York I believe satisfaction (not achievement) is the key to happiness. You have a life you love, and when the kids leave, you’ll have a world of options: You could go to school, start a business, write a book and more. (As for me, I have never regretted a moment I spent with my children.) Yes, many things will go awry, but many things will go awry for your friends too.