※ 밑줄 친 부분에 들어갈 가장 적절한 것을 고르시오. [문 14～문 16] The highs and lows of life may seem to have no predictable plan. But scientists now know there are very definite life patterns that almost all people share. Today, when we live 20 years longer than our great-grandparents, it is clearer than ever that the "game of life" is really a game of ______________. As we age, we trade strength for ingenuity, speed for thoroughness, passion for reason. These exchanges may not always seem fair, but at every age, there are some advantages. So it is reassuring to note that even if you've passed some of your "prime," you still have other prime years to experience in the future. Certain important primes seem to peak later in life.