In general, this research was examining moral judgements, that is, judgements of acceptability of dilemmas. The aim of this research was to examine differences in moral judgement between participants for whom were supposed that, according to the literature, had different degree of development of prefrontal cortex. Also, the second aim was to examine sex differences in moral judgement, as well as the differences in proportions of „appropriate“ responses to three types of dilemmas. These dilemmas were divided into non-moral (without moral meaning), moral impersonal dilemmas (intuitively impersonal and less emotional) and personal moral dilemmas (intuitively „up close“, personal and more emotional). Participants were 52 high school students (23 female and 29 male) of „Prva sušačka hrvatska gimnazija“ in Rijeka aged 15 to 18 and 60 students (50 female and 10 male) at Faculty of Fumanities and Social Sciences aged of 20 to 27. Research was conducted on computers. Participants responded to 39 dilemmas (13 personal moral dilemmas, 13 impersonal moral dilemmas and 13 non-moral dilemmas) by pressing one of two buttons („appropriate“ or „inappropriate“) on the keybord. The results showed significant effect of dilemma on the proportion of „appropriate“ responses. Participants gave significately more „appropriate“ responses to non-moral dilemmas compared to moral impersonal and moral personal dilemmas. Also, participants gave significately more „appropriate“ responses to moral impersonal compared to moral personal dilemmas. Results also showed significant interaction of Group x Dilemma. There is a significant difference between high school students and faculty students in proportion of „appropriate“ responses to personal moral dilemmas. High school students gave significately more „appropriate“ responses to personal moral dilemmas compared to faculty students. Results also showed significant interaction of Sex x Dilemma. There is a significant difference between men and women in proportion of „appropriate“ responses to personal moral dilemmas. Men gave significately more „appropriate“ responses to personal moral dilemmas compared to women.