Gender

In the old days, it was so simple: Men hunted and women raised the kids. Then we moved out of caves, invented gender studies, and learned a bit about genetics. Now nothing is clear-cut.

Aging

By 2030, the number of Americans age 65 and over is projected to be about 71.5 million, of which nearly 10 million will be 85 or older. The good news is that many seniors report better health, greater wealth, and higher levels of education than older people in the past.