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

Age is a case of mind over matter. If you don't mind, it don't matter.

Age is strictly a case of mind over matter. If you don't mind, it doesn't matter.

Magic: it was what happened when the mind met the world, and the mind won for a change.

I, Mark Twain being of sound mind, have spent everything

Wrinkles should merely indicate where the smiles have been.