The person without a purpose is like a ship without a rudder....

Old age is not a matter for sorrow. It is matter for thanks if we have left our work done behind us.

It were a real increase of human happiness, could all young men from the age of nineteen be covered under barrels, or rendered otherwise invisible and there left to follow their lawful studies and callings, till they emerged, sadder and wiser, at the age of twenty-five.

None of us will ever accomplish anything excellent or commanding except when he listens to this whisper which is heard by him alone.

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.

There is a fountain of youth: it is your mind, your talents, the creativity you bring to your life and the lives of people you love. When you learn to tap this source, you will truly have defeated age.

Life would be infinitely happier if we could only be born at the age of eighty and gradually approach eighteen.

Probably the happiest period in life most frequently is in middle age, when the eager passions of youth are cooled, and the infirmities of age not yet begun as we see that the shadows, which are at morning and evening so large, almost entirely disappear at midday.

Age is an issue of mind over matter. If you don't mind, it doesn't matter.

Common sense is the collection of prejudices acquired by age eighteen.

The older I grow the more I distrust the familiar doctrine that age brings wisdom.

Wisdom doesn't necessarily come with age. Sometimes age just shows up all by itself.