Age is an issue of mind over matter. If you don't mind, it doesn't matter.
Mark Twain
Anyone who stops learning is old, whether at twenty or eighty. Anyone who keeps learning stays young. The greatest thing in life is to keep your mind young.
Henry Ford
True terror is to wake up one morning and discover that your high school class is running the country.
Kurt Vonnegut
As I grow older, I pay less attention to what men say. I just watch what they do.
Andrew Carnegie
A diplomat is a man who always remembers a woman's birthday but never remembers her age.
Robert Frost
Nobody grows old merely by living a number of years. We grow old by deserting our ideals. Years may wrinkle the skin, but to give up enthusiasm wrinkles the soul.
Samuel Ullman