Mental imagery is a highly common aspect of everyday cognitive functioning. While substantial progress is being made in clarifying this fundamental human function, much is still unclear or unknown. Examining individual differences in age, sex, and background experience in an activity in relation to the sensory and motor modality and intentionality level of imagery as well as the relation between them will contribute to a more comprehensive account of this mental function. The current online study combined multiple imagery self-report measures in a sample (n=279) with a substantial age range (18-65), aiming to identify whether age, sex, or background experience in sports, music, or video games were associated with aspects of imagery in the visual, auditory, or motor stimulus modality and voluntary or involuntary intentionality level. The findings show weak associations between age and auditory imagery aspects, weak associations between sex and visual imagery, and relations of music and video game experience with involuntary musical imagery. Moreover, all imagery stimulus modalities were associated to each other, for both intentionality levels, except involuntary musical imagery, which was only related to voluntary auditory imagery. These results replicate previous research but also contribute new insights, showing that individual differences in age, sex, and background experience can make modest contributions to various aspects of imagery. The findings can inform the growing domain of applications of mental imagery to clinical and pedagogical settings.