Morgan, Jessica, Robinson, Oliver ORCID: 0000-0002-6758-2223 and Thompson, Trevor ORCID: 0000-0001-9880-782X (2015) Happiness and age in European adults: The moderating role of gross domestic product per capita. Psychology and Aging, 30 (3). pp. 544-551. ISSN 0882-7974 (Print), 1939-1498 (Online) (doi:https://doi.org/10.1037/pag0000034)