The Seven Causes of Aging

 These causes were delineated by Aubrey de Grey, Cambridge University

1. Cell loss and cell atrophy
2. Accumulation of cells
3. Nuclear mutations of nuclear DNA (cancer)
4. Mitochondria mutations, Mitochondria DNA mutations
5. Intracellular junk buildup
6. Extracellular junk buildup
7. Extracellular processes, protein build up and chemical reactions that are outside cells. Artery rigidity

The longest living human ever documented was Jeanne Calment who died in southern France in 1997 at age 122. https://en.wikipedia.org/wiki/Jeanne_Calment