This study critically examines the minimum marriage age standards in classical fiqh through an epistemological integration of the Islamic turats specifically the concept of rushd in Maqasid al-Shari’ah and neuroscientific findings on the maturation of the prefrontal cortex (PFC). A normative-comparative approach based on library research was employed, drawing on primary sources such as classical fiqh texts (al-Umm, Bidayat al-Mujtahid, al-Mughni), Indonesian legislation, and reputable neuroscience journals. The study found that rushd al-akl in the Islamic tradition is epistemically compatible with biopsychological maturity in neuroscience. Data on marriage dispensations in Indonesia from 2019 to 2023 show an approval rate of 81–87%, indicating that judges still rely solely on bulugh as a consideration. The proposed synthesis of rushd and biopsychological concepts strengthens the normative foundation for reforming the marriage age by integrating the Maqasid of hifz al-nasl and hifz al-'aql with neurobiological evidence.
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