Getting older changes more than our faces, bodies, and daily routines. It can also change the way we see ourselves, how we treat other people, and how we respond to a world that no longer feels as familiar as...

Reaching 80 is no longer unusual in many parts of the world. But what happens after that can be very different from what people imagine. Some people remain active well into their 80s and 90s, while others begin to lose strength,...