Aging is generated by insufficient adaptation and reparation of living organism.
The living organism are genetically constructed by evolution for maximal fitness and survival until the reproduction age, after that the evolution stops and we are like a satellite send in space for a one shoot mission, after the data are gathered, the satellite will continue sending messages until something will get fatally broken.
Mortality is not aging, but having an increasing change of dying from a specific cause could be classified as aging.
All living organism continually need to fight 3 diseases to survive:
1. Cardiovascular Diseases
3. Immune System Aging, Decline and Diseases
With the discovery of antibiotics we started to win the battle against bacterias and we witnessed an a big boom in the medium life spam from 30-40 years to 60-80 years.
The fall of infections leaved much more room to other Aging diseases.
Cancer is a constant threat for complex living organisms, 1 in 3 people will die of cancer. If we survive long enough cancer will get us, but will be very hard to survive for such a long time because of the exponential rise of Cardiovascular Diseases with age.
Cardiovascular Diseases are so usual that we have come to see death from them as the 'natural' end of life.
We have increased the life expectancy by conquering diseases of childhood and midlife but we have small progress in curing the organism degeneration caused by old age.