For How We Get To Next's health month, I put together some visualisations of life expectancy around the world. The pictures are more interesting than the words, but here's an excerpt:
Human lifespan has skyrocketed since we emerged as a species. In the Bronze and Iron Ages, life expectancy at birth is thought to have been about 26 years. In 1900, it had only risen to 31 years. But the spread of public health measures changed things, fast. By 1950, average life expectancy at birth had increased to 48 years. In 2010 it was 67.2 years. Who knows what it may reach in the future, and what the effects might be.
For the rest, you should click through and read the full article.