Aubrey de Grey: A roadmap to end aging

TED  2005
Aubrey de Grey: A roadmap to end aging  (script)
Summary
I was not convinced with that article. I don't think that I didn't understand English and everybody could understand this also.
The speaker said that a roadmap to aging has five points: (1)why defeating aging is desirable, (2)why we have to solve defeating aging problem well, (3)we have to do a bit more than we do, (4)whether it's a feasibility, or not  and (5) why we are so fatalistic about doing anything about aging.
First, why defeating aging is desirable is, of course, that aging kills many people.
Next, why we have to solve defeating aging problem well, because people worry about overpopulation.
Why we have to do a bit more than we do, because we feel that aging is inevitable strongly.
And then, the story is getting a bit more complicated, from here.
In fact, when we were born, we start aging and aging is a side effect called metabolism. It accumulates and causes a disease. Although we have self-repair mechanisms, it's not perfect. 
However, this is a strange part. If it's eliminated, we cannot live.
He says that defeating aging means that one is life extension of yourself. The second is an elimination of the relationship between aging and death or aging and sick. That is certainly true though it leads to a dilemma. It's because no one's going to die or the death rate is going to much lower and we're not going to be able to have enough kids. People worry about overpopulation though they hope yourself life extension.
In the last, he said that we can stop the aging 90 percent, if there are enough funds. A global trance: aging is inevitable, interrupts to stop it also.
Words in this story
gerontology / the scientific study of old age, the process of aging, and the particular problems of old people.
feasibility / possibility,
inevitable / certain to happen, unavoidable.