Aging changes in bones, muscles, joints http://www.nlm.nih.gov/medlineplus/ency/article/004015.htm continue reading MedicinePlus osteoporosis nih.gov our bodies change natural aging http://www.nlm.nih.gov/medlineplus/ency/article/004015.htm as muscles age, they begin to shrink and lose mass nlm.nih.gov nlm.nih.gov http://www.nlm.nih.gov/medlineplus/ency/article/004015.htm aging affects bones. bone structure even changes Medline Plus: Aging Changes in the Bones, Muscles, Joints lose some bone density as they age The National Library of Medicine ageing process MedlinePlus: Aging Changes in the Bones - Muscles - Joints ageing process our bodies change broken down and regenerated nih.gov Bone density decreases with age