a, Kaplan-Meier overall survival curves for Framingham, Heart Study participants stratified based on median values of their IMM-AGE scores adjusted to cardiovascular risk factors and cardiovascular disease. Yellow and blue curves correspond to individuals with low and high IMM-AGE scores, respectively (P = 0.018, n = 2,290, two-sided log-rank test). b, Interaction between age and life history creates an immunological landscape dictating the composition of the cellular immune system.