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Most infertility specialists define an older woman as one who is more than 35 years, but this is an arbitrary number. A woman's fertility does not fall off at a particular age, but starts declining gradually after the age of 30. After 35, the drop is fairly dramatic; and after 38, it's even more so. However, there is no magic number at which fertility disappears and this decline is a progressive irreversible process.
In the past, it was assumed that as the woman got older, her entire reproductive system started failing. However, today we know that the uterus and the fallopian tubes remain relatively unaffected by age; and that the reason for the decline in fertility is the diminished number of eggs left in the ovary. Every girl is born with a finite number of eggs, and their number progressively declines with age.
A measure of the remaining number of eggs in the ovary is called the "ovarian reserve"; and as the woman ages, her ovarian reserve gets depleted. The infertility specialist is really not interested in the woman's calendar (or chronological age), but rather her biological age - or how many eggs are left in her ovaries.
Infertility and the Midlife Crisis
Many women in their late 30s and early 40s have postponed marriage or childbearing to obtain their education, establish themselves in careers, and become financially secure. These aspirations frequently have worked against the decision to have children. The passage of time, however, alters the way many women feel about motherhood by changing their perceptions about themselves as well as about the world around them.
Additionally these changes may also have to do with having a new sense of maturity as well as a feeling of accomplishment. Thus, as women and men-feel more secure about themselves, their feelings and ideas about children and parenthood may also change.
As a couple moves into midlife, they must also begin recognizing and coming to terms with their own mortality. For many, parenthood is a part of successfully completing an important stage in life. As couples begin to see and understand the passage of their own lives, the need to pass along life experiences to new generations enhances the meaning of life.
Men and women in midlife, who have made the decision to have children, may find to their dismay that they are frequently thwarted by the inability to conceive or by recurrent miscarriages. For women, the realities of the biologic clock cannot be overlooked. At this point, many couples are faced with dual crises which can compound their problems - infertility, as well as a midlife crisis - the developmental life changes that normally occur in the middle years.
As women reach menopause, they begin to realize that the option of conceiving and bearing a child is closed to them. Just as the array of other life choices begins to narrow, the loss of this ability to choose to have a child can result in sadness and deep disappointment. The realization of this "missed opportunity" can also lead to self-recrimination and depression.
The Biological Clock
This is why the older woman presents a number of unusual personal problems. For one, most women can hear their own biologic clock ticking away loudly, and don't like being reminded about the fact that their age can be a limiting factor in their fertility. Moreover, many of these women are busy executives pursuing a career. They are very used to being successful, and find it difficult to come to terms with their biologic frailty. Because of all the media hype , they expect the assisted reproductive technologies to provide them with a quick answer.
However, few reports emphasise that pregnancy rates in older women, even with IVF, are only half of what they are with younger women. So that typically, a woman who is more than 40 years of age has a less than 10 % chance of having a live birth in an IVF cycle. Older women also find it much more difficult to get social support. Society can be both sexist and ageist, and most people feel it is "unnatural" for an older women to want to try to get pregnant.
Older Infertile Women- The Challenges
The major problem for the older woman is that time is at a premium! She simply cannot afford to waste her precious time on ineffective treatments; and it is better for her to move on to IVF sooner rather than later. Older women present doctors with many challenging problems:
Some Relevant Questions
"Menopausal mums" have grabbed much media attention, and have raised a number of controversies - which still remain unresolved. Much research is going on to try to increase the pregnancy rates after IVF in older women and the options are:
The good news is that success rates with donor egg IVF and donor embryo IVF are very high !
Right now the world record for the oldest mother has been set in India and the oldest woman who has given birth is 73 ! At an age when most women have become grandmothers, is it sensible for a woman to want to have a child ?
Let's explore this in more detail. Let's suppose we decide , like some countries have done, that the age cut-off should be 45 and that women who are more than 45 should not be allowed to have IVF treatment, because they are "too old". Then what happens if a 46 year old woman who is otherwise very healthy wants to have a baby ? Is it fair to say no to her just because she is one year past the cut off age ? Why ?
It's quite likely that older woman are going to make very good mothers. They are mature - and have spent a lot of time and energy in making this decision, which means they are likely to be thoughtful and caring parents ! While they may not have as much physical energy, they are likely to have many more financial resources ! And they are much more likely to make better parents than 14 year old unmarried girls (who society allows to have babies , just because they are capable of doing so biologically and do not need our permission to do so !).
I agree this does raise a number of ethical issues ! Is it fair for the child (who is likely to become an orphan at a young age, because his mother is likely to die in a few years) ? Should society lay down guidelines (like it does for adoption ) ? Or is it a decision which the woman should make for herself ? Are we being ageist by not allowing older women to use this technique, just because we think it is "unnatural" ? Isn't it sexist as well ? When a 70 year old man gets a 20 year old woman pregnant, society applauds his virility and manhood !
Why shouldn't we be happy to encourage older women who want to have kids as well? After all, this is their personal decision, and we should be happy to honour their autonomy. They are not harming anyone and if they are well off enough to afford IVF treatment with their own funds, presumably they are well off to be able to provide for the child's well-being, even after their death.
Maybe in an Indian joint family, the child will be well-cared for, whether the birthing mother is infirm or not ? One option would be to make independent counseling mandatory for older women, before they go in for IVF , so we can make sure this is a well-informed decision.
An exciting option for the future may be that of egg banking. A lot of research is being focussed on developing more efficient methods to cryopreserve and store eggs. If this becomes clinically practicable, then it may become possible to freeze a woman's eggs or ovarian tissue when she is young, and store these for her in liquid nitrogen at -196 C, so that she can use her own "young" eggs in the future, whenever she decides to start her family !
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