Today Life Expactency is 80 years. 20 years from now It would be 100 years. So those who are below age of 60 can think of living upto 100 years.
The reasion for increase in Life Expactency is the technological advancements in Medical Science and soon it will be able to cure all diseases mankind has along with old age problems.
After 40 years Life Expactency will be 150 years as All body parts could be replaced by artificial limbs and machines. And people at the age of 150 will be able to run faster than Olympic winners.
Yesterday I read artificial bones have been developed which last longer than the bones we have giving old people a strong support.