New research presented at this year's European Congress of Clinical Microbiology and Infectious Diseases (ESCMID 2024, Barcelona 27-30 April) shows that levels of resistance to antimicrobials (AMR) varies with age and sex, with age in particular showing substantial variation both between and within countries. The study by Gwen Knight, Associate Professor at the London School of Hygiene and Tropical Medicine and co-Director of the LSHTM AMR Centre, London, UK, and colleagues, is published in PLOS Medicine.