It's already possible to live to 100, thanks to science ... Medicine, diet, and exercise.
Will science find a serum to make man stop aging at 30, and keep man alive to age 100?
Although people today live to 100 plus and average 70 years is a current life age. However, there are some genetic research that finds man can live longer then they currently do.
There's interesting research going on now about blood transfusions. Lab mice responding well to receiving " young " blood and it shows promise of fighting the effects of Alzheimer.