" Youth is not a time of life-it is a state of mind. It is not a matter of ripe cheeks, red lips, and supple knees; it is a temper of the will, a quality of the imagination, a vigor of the emotions;it is a freshness of the deep spring of life.
Youth means a temperamental predominance of courage over timidity, of the appetite of adventure over love of ease. This often exists in a man of fifty more than in a boy of twenty.
Nobody grows old by merely living a number of years; people grow old by deserting their ideals. Years wrinkle the skin, but to give up enthusiasm wrinkles the soul. Worry, doubt, self distrust, fear, anddespair-these are the long long years that bow the head and turn the growing spirit back to the dust.
Whether seventy or sixteen,there is in every beings heart the love of wonder, the sweet amazement at the stars and the starlike things and thoughts, the undaunted challenge of events, the unfailing childlike appetite for what next, and the joy and the game of life.

You are as young as your faith, as old as your doubt; as young as your self-confidence, as old as your fears; as young as your hope, as old as your despair."

-----------------Samuel Ullman