Brain immunity may undergo a major midlife overhaul linked to neuroinflammation

MedicalXpress | Jul 23, 2026

A new study indicates that the immune cell landscape of the hippocampus, a brain region critical for learning and memory, rapidly undergoes substantial remodeling beginning in midlife. This previously unrecognized shift suggests a potential mechanism by which aging may contribute to chronic neuroinflammation commonly observed in neurodegenerative disease.