This research aims to investigate whether gender and age of Professional Accountants influence their opinion upon accounting judgments and sustainable decision-making. Through a questionnaire, accountants were interrogated about their education, professional profile, age, gender, personality traits, and their perception on accounting judgment and professional behavior. On one hand, results showed that women accountants are more inclined to comply with accounting regulations and more interested in following an ethical behavior. Moreover, women tend to be more interested in fulfilling managers’ expectations and more willing to collaborate. On the other hand, men accountants proved to be more independent in judgments and more skeptical. Furthermore, men have a greater propensity to make accurate, sustainable judgments, considering the evaluation of goodwill as more important than women. However, no correlations were found between age, gender and accountants’ perception on the theoretical framework of professional accounting judgment. As the age of accountants grows, the compliance degree to regulations increases. This study adds value to gender accounting literature by the way it examines accountants’ behavior and perception towards accounting judgments and sustainable decisions in correlation to gender diversity and age.