Wrinkles should merely indicate where the smiles have been.

The first half of life consists of the capacity to enjoy without the chance; the last half consists of the chance without the capacity. -Mark Twain.

Consider well the proportion of things. It is better to be a young June bug, than an old bird of paradise. -Mark Twain.

We can't reach old age by another man's road. My habits protect my life but they would assassinate you.

I was young and foolish then; now I am old and foolish

Genius has no youth, but starts with the ripeness of age and old experience.