I'm wondering too what she is anxious about. Do you mean looking at the heading of your post question, she is worried she is not at the correct age for menopause? Anyway, the average age for menopause is 51 years old, but you can go 5 yrs either side. A menopause at the 40 age group is classed as a premature menopause. Hope this helps.
I don't understand - what is she worried about?