Brain age gap, dementia risk factors and cognition in middle age by Stefaniak, JD, Mak, E, Su, L, Carter, SF, Dounavi, M, Muniz Terrera, G, Bridgeman, K, Ritchie, K, Lawlor, B, Naci, L, Koychev, I, Malhotra, P, Ritchie, CW, O’Brien, JT