A collection of articles at Science Magazine examine aging as a collection of disparate processes: "Though we tend to speak of aging as a generic condition, its most devastating manifestations -- things like the deterioration of bones, joints, and neurons -- seem maddeningly specific to particular organs and tissues." Beating age-related degeneration through regenerative medicine - rather than preventing the root causes of the aging process - will require us to be able to repair many different types of damage to all our organs. It's a big job, which is why the level of funding and rate of progress are very important. Given the important recent research on the topic, you may find the article "What Can Progeroid Syndromes Tell Us About Human Aging?" interesting.