The Transom links today to a piece about how Proctor & Gamble is ramping up product lines aimed at older adults. “The flip side of the low birthrate is we’re all living longer,” said corporate exec Tom Falk.

In fact, the global trend over the last two hundred years has been toward longer lives and fewer babies. This trend really gathered momentum in just the last half-century or so. Consider this short video I put together for a talk at last month’s Acton University.

The two axes correspond to fertility (horizontal) and life expectancy (vertical). So in the bottom right we are having more children and shorter lives, while in the upper left we are having fewer children and living longer. Each of the countries in the world is represented by a circle, whose size is determined by size of population. Each region is also color coded.

What you’ll see as we move forward through the last two centuries is a gradual shift toward the upper left, which turns into a rush after about 1950. There are a few lagging countries in Africa, which still are moving toward the upper left, just a bit more slowly. Watch it again, and note the brief drops in life expectancy corresponding to each of the twentieth-century world wars.

Where we start in 1800 was just about where humans have been for recorded history: short lives and lots of kids. Now within the last 50 years we’ve seen a monumental shift that really is unprecedented on a global scale. Think for a few minutes about plex causes of this shift and the massive changes in social, political, and economic dynamics that undergird it and also flow out of it.

We really have never seen its like before.