Average life expectancy will be 100-120 years

Ilya Ilyich Mechnikov : Biologist, zoologist and protozoologist
"... in a more or less distant future it will be possible to change the state of old age. From being painful and repulsive, as it is now, old age will address the physiological and bearable. We will achieve greater durability as compared to the present. (100 - 120 years)"

"The nature of men"