I was talking about life expectancy for a 50 year old. Life expectancy at birth has increased significantly more because of reduced risk of death for newborns, infants and even teenagers. But once you are of a certain age, those risks are gone, and there not much has changed.
No, I don't believe in scifi. Theses are all fantasies. Just as little as I believe in living on mars being a great alternative to earth. Nice scifi story, but in real life, things are different.
If you just look at the spread obesity in the U.S. and its effect on life expectancy, please tell me again with a straight face that you expect "people live to be over 100" in the future. And no, they don't today. You are talking about a really really small minority, and that minority was already there 50 years ago. In 1970.
Edit: Life expectancy for a 50 yeah old in 1920 in Sweden was about 9 years shorter than today.