The article focuses on the social differences of educability constructed in Finnish general upper secondary school adult graduates' narratives on mathematics. Social class, gender, and age intertwine in the narratives that express the adult students' worries about their ability and competence to study and learn mathematics. Social differences of educability are transformed into individual conceptions of ability in an intrusive way that has consequences far beyond the ability to learn mathematics. This concerns such issues as whether one's ability and competence as a student and learner suffice to complete studies at GUSSA and pass the matriculation examination, as well as one's chances of succeeding in further studies and working life. The study confirms that mathematics continues to be constructed as a masculine prototype of intelligence. Being "good" at mathematics, moreover, implies having intelligence and innate natural talent.