Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Female Infertility ?
    ### Response:
    Infertility means not being able to get pregnant after at least one year of trying (or 6 months if the woman is over age 35). If a woman keeps having miscarriages, it is also called infertility. Female infertility can result from age, physical problems, hormone problems, and lifestyle or environmental factors.
    