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The human skeleton is the internal framework for your body. When you were born you have around 270 bones but some get fused together and as an adult most people have 206 bones. The bone mass in your skeleton reaches maximum density at around age 21. The skeletal system includes all of the bones and joints in your body. Each of them is a complex living organ that is made up of cells, proteins, fibers and minerals. Your skeleton acts as a scaffold by providing support and protection for the soft tissue that makes up the rest of your body.