1 Older Person Assessment Unit (OPAU), Guy's Hospital, Westminster Bridge Road, London SE1 7EH, UK, Email: magda.sbai@nhs.net.
2 Perioperative medicine for Older People undergoing Surgery (POPS), Department of Ageing and Health, Guy's and St Thomas' NHS Foundation Trust, London.
3 Division of Primary Care and Public Health Sciences, Faculty of Life Sciences and Medicine, King's College London.