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Although disruptions in this functional connectivity are associated with brain disorders, evidence on its healthy age\u2010dependent variation and behavioral relevance remains limited. Utilizing magnetoencephalography (MEG) recordings from 576 adults aged 18\u201387\u2009years, we investigated the evolution of resting\u2010state functional connectivity (rs\u2010FC) across the healthy adult lifespan. We observed age\u2010related, frequency\u2010specific changes in widespread cortical networks. Alpha\u2010band (8\u201313\u2009Hz) rs\u2010FC decreased, while delta (1\u20134\u2009Hz), theta (4\u20138\u2009Hz), and gamma\u2010band (40\u201390\u2009Hz) rs\u2010FC increased with age. Beta\u2010band (13\u201330\u2009Hz) rs\u2010FC followed a non\u2010linear trajectory, peaking in middle age. The global delta, theta, alpha, and beta\u2010band patterns differed from concurrent changes in oscillatory power, underscoring their dissociable contributions. Notably, reduced beta\u2010band rs\u2010FC was associated with increased sensorimotor attenuation, indicating that changes in rs\u2010FC are behaviorally relevant for sensorimotor function. These findings advance our understanding of healthy brain aging and highlight a link between resting\u2010state brain activity and sensorimotor integration.<\/jats:p>","DOI":"10.1002\/hbm.70484","type":"journal-article","created":{"date-parts":[[2026,3,8]],"date-time":"2026-03-08T16:57:35Z","timestamp":1772989055000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Frequency\u2010Resolved Cortical Functional Connectivity Across the Adult Lifespan"],"prefix":"10.1002","volume":"47","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-6754-5979","authenticated-orcid":false,"given":"Santeri","family":"Ruuskanen","sequence":"first","affiliation":[{"name":"Department of Neuroscience and Biomedical Engineering Aalto University  Espoo Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0436-4955","authenticated-orcid":false,"given":"Juan 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