Michelle Emblenton, biochemist at inviTRA, answers us in the following video:
Well, really this question could be interpreted in two ways. The first is "can I have an antral follicle count at any time in my menstrual cycle". The AFC account will be performed between days two and four of your menstrual cycle during the follicular phase. If we consider this question to be "at what age should I have an AFC account", any age is the answer. If you are a young woman and you know you're going to postpone your maternity till later in life (for example you want to concentrate on your career first and think I want to have my children in my late 30s), it's not a bad idea to have an antral follicle count performed and perhaps an AMH test to get an idea of your ovarian reserve. That way, if it looks there may be any fertility issues as you get older, you can take the measurements now and preserve your fertility for later in life and, if necessary, it's so overcoming your own egg donor for the future.
https://youtu.be/WQzFYL7Hbyc