Typically, younger individuals (30 to 60 year olds) are more likely to experience back pain from a lower back muscle strain or from within the disc space itself – such as a lumbar disc herniation or lumbar degenerative disc disease.This article details a description of typical symptoms and their possible causes in younger adults.

Key Takeaways:

• There are many possible causes of lower back pain, with the majority being mechanical in nature. It is often linked to spondylosis, the degeneration of the intervertebral discs of the spine due to everyday wear and tear.
• As people age, it is normal for the rubbery intervertebral discs of the spine to lose integrity through a process known as spondylosis. These discs are usually responsible for cushioning the individual bones of the spine as they move on each other during bending and flexion.
• If a spine nerve root is compressed, inflamed, or otherwise injured, the pressure on the nerve can lead to pain, numbness or other sensations such as tingling, in various areas of the body, depending on the nerve that was affected.

“Sciatica is a type of radiculopathy that involves compression of the sciatic nerve, the main nerve to the leg.”

http://www.news-medical.net/health/Causes-of-Lower-Back-Pain.aspx