https://www.bilibili.com/video/BV1Fz4y197dd important
Youth is not a time of life: it is a state of mind; it is not a matter of rosy cheeks, red lips and supple knees; it is a matter of will, a quality1 of the imagination, a vigor of the emotions, it is the freshness of the deep springs of life.
figurative
Youth means a temperamental predominance of courage over timidity of the appetite (胆怯的欲望之上), for adventure2 over the love of ease. 对于冒险性情的主导地位 舒适的热爱之上
This often exists in a man of sixty more than a boy of twenty. Nobody grows old merely by a number of years. We grow old by deserting out ideals.
Years may wrinkle the skin, but to give up enthusiasm wrinkles the soul. Worry, fear, self-distrust bows3 the hearts and turns the spirit back to dust.
Whether sixty or sixteen, there is in every human being’s heart the lure of wonder, the unfailing child-like appetite of what’s next, and the joy of the game of living. In the center of your heart and my heart there is a wireless station; so long as it receives messages of beauty, hope, cheer, courage and power from men and from the infinite4, so long are you young.
When the aerials are down, and your spirit is covered with snows of cynicism and ice of pessimism, then you are grown old, even at twenty, but as long as your aerials are up, to catch the waves of optimism, there is hope you may die young at eighty5.
The methods herein set forth are for people whose desire for riches6 is strong enough to overcome mental laziness and the love of ease, and make them work.