While certain physical and mental problems may arise due to aging, they may also be symptoms of depression that should be carefully evaluated by a physician. Above all, it is never normal to feel unhappy day after day, simply because you're growing older. The National Institutes for Health have free pamphlets for depression written for various age groups. Nobody grows old by merely living a number of years. People grow old only by deserting their ideals.
Years wrinkle the face, but to give up enthusiasm wrinkles the soul.