My daughter is 13 and has lower back pain. She has been seeing a PT and has been doing exercises. She also runs track. Her pain started somewhat last year and progressively has gotten worse. We thought it was because of carrying a heavy backpack to school and we had her put her backpack on a hand dolly for less stress. Also, we bought her a new mattress as well. Today, she complained that her pain level was about a 7 and normally it has been in the 3-5 range.