translation.en: Once we had followed our men all the way into their 80s, we wanted to look back at them at midlife and to see if we could predict who was going to grow into a happy, healthy octogenarian and who wasn't.
translation.zh: 当我们的研究对象步入80岁时， 我们会回顾他们的中年生活 看我们能否预测 哪些人会在八九十岁时过得快乐健康 哪些人不会。