Ovarian reserve can be assessed at any time if there are reasons to do so, such as menstrual irregularities, a family history of early menopause, or if you are thinking of postponing childbearing. However, from the age of 30 onwards it is advisable to start keeping an eye on this aspect if you are planning your fertility. As you get older, the quantity and quality of your eggs gradually decreases, especially after the age of 35, so having this information can help you make more confident decisions.