A woman’s age can be important:
Many women are aware that around the age of 35, their natural fertility starts waning. The success rates factors of pregnancy are diverse and varied for every woman. The exact time varies considerably but occurs when the ovaries start to produce less eggs. At the age of 25 it is likely that a woman has many functioning follicles in the ovaries. Every month, one of these follicles will produce an egg. As the follicles function declines, so it can be that an egg is produced not every month, but every couple of months. When this happens, from the early forties, the women has entered into early menopause. Therefore if a woman was trying to become pregnant, it could be that it takes longer to become pregnant because not every month an egg is being produced.
Women’s fertility decreases with age from about the age of 35 onwards and their fertility reduction starts to become significant after the age of 40. This reduction is related to the decline in the number of “eggs” that remain in the ovaries as these are used up over the years from the finite number that are available from the onset of periods. It is possible that Mr Dobson may advise a blood test prior to you going ahead with a reversal procedure. He will discuss this with you at your consultation.
Also, other internal ageing takes place. The lining of the womb, the endometrium, can decline in thickness so if the woman is still producing healthy eggs, the depleted lining may prevent a pregnancy from occurring.
The fluid in the vagina also changes as a woman gets older and it becomes thinner which results in the sperm being unable to live for the length of time required to get to the egg and fertilise it.
At around the age of 35, natural fertility starts waning, but it doesn’t suddenly stop! It is different for every woman and a persons fertility history is the best predictor of success. For example, if you conceive easily at the age of 36, your fertility at the age of 40 will likely still be very good. However, if you struggled to conceive at the age of 30, you may struggle more at the age of 40. This reduction in fertility with age occurs due to an increase in the likelihood of the egg that is released that month being less genetically normal as we age. At the age of 20 a woman has many healthy and genetically normal eggs in the ovaries (around 9 out of 10 eggs released will have the ability to make a healthy baby). But as the women gets older, the number of genetically normal eggs that she will release each year declines, so that by the age of 40 only around 10% of eggs released in a year have the ability to form a healthy pregnancy. It is for this main reason, that the chance of pregnancy each year declines.