Cosmo Strozza, Virginia Zarulli, and Viviana Egidi of the Interdisciplinary Centre on Population Dynamics (University of Southern Denmark) and University of Rome “La Sapienza” analysed the 90+ population in Denmark to study how demographics, socio-economic characteristics and one’s lifestyle affect changes in physical and cognitive health, whether there is a pattern to these changes and how physical or cognitive aspects affect transitions of the other dimensions.