Most people probably wouldn't look at aging like one, but aging is actually fairly similar to a disease, one that ultimately catches up with everyone. There's no real smoking gun with regards to what causes us to age, but there are a few culprits: Every normal cell has within it an ultimate limit on the number of times the cell can divide before dying. This limit is known as the Hayflick Limit, and ultimately determines when cells in the body die. It is believed that this limit is a direct result of the influence of the enzyme telomerase whichs repairs the end of DNA segments. In most cells it's ...