During the past two decades, a substantial amount of research has been carried out in order to improve our knowledge on ovarian response predictors. Age has often guided infertility treatment choices, since a woman's chronological age is the single most important factor in predicting a couple's reproductive potential, as it is generally acknowledged that reproductive ageing is related to both quantitative and qualitative reduction of the primordial follicle pool. However, age alone is of limited value and so it cannot predict the response to infertility treatment.