For generations, the calendar has been the gatekeeper of breast cancer screening — a blunt but democratic tool that treated all women as equally at risk simply by virtue of age. Australia is now beginning a decade-long reckoning with that assumption, moving toward a model that reads each woman's biology — her tissue density, her genes, her family history — as a more honest map of danger. The shift reflects a broader truth in medicine: that equity sometimes demands difference, and that the most compassionate system is one that listens to the individual before it consults the calendar.