Youth is not a time of life; it is a state of mind; it is not a matter of rosy checks,
red, lips and supple knees; it is a matter of the will, a quality of the imagination,
vigor of the emotions; it is the freshness of the deep springs of life. Youth
means the predominance of courage over timidity, of adventure over the love
of ease. This often exists in a man of sixty more than in a boy of twenty. Nobody
grows old merely by a number of years. We grow old by deserting our ideas.
Years may wrinkle the skin, but to give up enthusiasm wrinkles the soul. Worry,
doubt, self-distrust, fear and despair - these bow the heart and turn the spirit
back to dust. You are as young as your faith, as old as your doubt.