New research analyzes travel surveys from major global cities, including Hong Kong, to find that seniors aged over 66 are more socially mobile than previously believed.

Earlier this week I stumbled on a fascinating piece of research led by geography professor Becky Loo at the University of Hong Kong and soon to be published in the Nature Cities journal. Fascinating not just because of its scale – an analysis of 200,000 household travel surveys covering Boston, Chicago, London, Sao Paulo and Hong Kong – but because of its focus on daily mobility and social mixing. Its key finding? That people aged over 66 have more encounters with a broader cross-section of...