A Pattern Language, a seminal work on architecture and urban planning by Christopher Alexander, Murray Silverstein, and Sara Ishikawa, lists as pattern #40, “Old People Everywhere.” In many places, that’s already the reality.

By 2050, one-quarter of Australia’s population will be 65 or older. Providing the housing types that seniors will need and want will likely be challenging. What type of seniors housing will they want? Understanding that issue will require breaking down the cohort according to different needs. According to Deane Simpson,…