“If your spine is inflexible and stiff at 30, you’re old. If it is flexible at 60, you’re young. A man is as young as his spine.” Joseph Pilates A key difference between a youthful individual and an aged individual is the ability to move correctly. Mobility is a vital ingredient to spinal and bodily health. The spine contains the spinal cord, which is part of the central nervous system which conveys vital information from the brain to all body parts via the peripheral nervous system.