Final answer:
Fibroadenomas can develop in prepubertal girls, adolescents, young adults, and women in perimenopause.
Step-by-step explanation:
Fibroadenomas are benign masses of cells that can develop in the breast tissue. They are most commonly seen in prepubertal girls, adolescents and young adults, and women in perimenopause. Postmenopausal women are less likely to develop fibroadenomas, but it is still possible.