Brain structural differences between 73- and 92-year olds matched for childhood intelligence, social background, and intracranial volume.

"Disclosure statement The authors have no actual or potential conflicts of interest."

"The authors thank the Lothian Birth Cohort 1921 and 1936 participants and research teams. We are grateful to the Scottish Council for Research in Education for access to the data from the Scottish Mental Surveys of 1932 and 1947. We thank the nurses, radiographers, and other staff at the Wellcome Trust Clinical Research Facility and the Brain Research Imaging Centre in Edinburgh. The Lothian Birth Cohort 1921 data collection was supported by the Biotechnology and Biological Sciences Research Council (BBSRC; 15/SAG09977) and by a Royal Society-Wolfson Award to author IJD. The Lothian Birth Cohort 1936 data collection was supported by Age UK (Disconnected Mind project). The work was undertaken by The University of Edinburgh Centre for Cognitive Ageing and Cognitive Epidemiology, part of the cross-council Lifelong Health and Wellbeing Initiative (MR/K026992/1). Brain imaging analysis was supported by the Medical Research Council (MRC; G1001245 and G0701120), which also supports author SRC (MR/M013111/1). Author JMW is partly funded by the Scottish Funding Council as part of the SINAPSE collaboration. We thank Dr Elliot Tucker-Drob for suggesting the analyses adjusting for the Flynn effect."