A large sample (N =1,279) of high school students was assessed using the Career Maturity Inventory (CDI-A; Lokan, 1984). The two composite scales of Career Development Attitude and Career Development Knowledge were examined in relation to age, gender and whether the students had engaged in paid work experience. Levels of career maturity increased with age, and in general, females at all age levels reported higher levels of maturity than males. Students with paid work experience reported higher levels of Career Development Attitude than those with no paid work experience. Career Development Knowledge was not associated with paid work experience. Gender differences also occurred, with females with paid work experience generally reporting higher levels of career maturity than males with paid work experience. Results are discussed in a developmental context.