In this article, we examine the gender differences in disposable incomes of teenagers during a 30-year period 1983-2013, using large nationally representative survey data. Since the gender pay gap in working life has been rather persistent in Finland and the EU, it was necessary to see whether the gap persists in teenagers' incomes as well. Although teenagers do not receive much income from work, they adapt to the structures of society during their teenage years and learn gender roles in consumption, education, and working life. Our results reveal that the gender pay gap has been rather persistent in Finland, particularly among 14- and 16-year-old teenagers. It is only among 18-year-olds that the gender difference in income has narrowed. There were interactions between gender and socio-economic indicators such as the father's education and family's place of residence. The persistent gender pay gap cannot be explained solely by wage differences in any age group, because full-time work of teenagers is nowadays very rare, and in Finland they do not work very much even part-time. Although it is rather obvious that boys get higher incomes than girls from external work, the allocation of money by parents seems to be unequal, too.