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Although females typically live longer than males, they have a higher susceptibility to diseases like Alzheimer's, speculated to be influenced by menopause, and reduced ovarian hormone production. Understanding sex\u2010specific differences is crucial for personalized medical interventions and sex equality in health. Our study aims to elucidate sex differences in regional cerebellar structure and connectivity during normal aging by investigating both structural and functional connectivity variations in the context of sex\u2010steroid hormones. The study included 138 participants (mean age\u2009=\u200957 (13.3) years, age range\u2009=\u200935\u201386\u2009years, 54% women). The cohort was divided into three groups: 38 early middle\u2010aged (EMA) individuals (mean age\u2009=\u200941 (4.7) years), 48 late middle\u2010aged (LMA) individuals (mean age\u2009=\u200958 (4) years), and 42 older adults (OAs) (mean age\u2009=\u200972 (6.3) years). All participants underwent MRI scans, and saliva samples were collected for sex\u2010steroid hormone quantification (17\u03b2\u2010estradiol (E), progesterone (P), and testosterone (T)). We found less connectivity in females between Lobules I and IV and the cuneus, and greater connectivity in females between Crus I, Crus II, and the precuneus with increased age. Higher 17\u03b2\u2010estradiol levels were linked to greater connectivity in Crus I and Crus II cerebellar subregions. Analyzing all participants together, testosterone was associated with both higher and lower connectivity in Lobules I\u2013IV and Crus I, respectively, while higher progesterone levels were linked to lower connectivity in females. Structural differences were observed, with EMA males having larger volumes compared to LMA and OA groups, particularly in the Right I\u2013IV, Right Crus I, Right V, and Right VI. EMA females showed higher volumes in the Right Lobules V and VI. These results highlight the significant role of sex steroid hormones in modulating cerebellar connectivity and structure across adulthood, emphasizing the need to consider sex and hormonal status in neuroimaging studies to better understand age\u2010related cognitive decline and neurological disorders.<\/jats:p>","DOI":"10.1002\/hbm.70356","type":"journal-article","created":{"date-parts":[[2025,9,17]],"date-time":"2025-09-17T12:07:17Z","timestamp":1758110837000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["The Influence of Sex and Sex\u2010Steroid Hormones on Cerebellar Structure and Functional Connectivity Across Adulthood"],"prefix":"10.1002","volume":"46","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0825-1387","authenticated-orcid":false,"given":"Thamires N. 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