As I approve of a youth that has something of the old man in him, so I am no less pleased with an old man that has something of the youth. He that follows this rule may be old in body, but can never be so in mind.
Source: In The Ultimate Success Quotations Library, 1997.
-- Marcus Tullius Cicero, (Jan 3 106BC-3BC), Roman statesman, scholar, orator; He introduced Greek philosophy to ancient Rome; wrote De Republica.