It is normal for a woman to have an anterior vaginal wall of about 9cm and a relatively long posterior wall of about 10-11cm. Due to individual differences, it is normal for some people to have a slightly deeper vagina and others to have a slightly shallower one, as long as they are within the normal range. The vagina of women is particularly stretchy because of the strong secretion of estrogen during the reproductive age, so there are many creases in the vagina and it is not smooth when you touch it. After menopause, the vaginal walls become smoother and the vaginal extension decreases due to the decrease of estrogen in the body, and the local resistance of the vagina also decreases.