This is a very emotive issue for obvious reasons. My son and dil had an IVF baby some years ago, who has brought such happiness for us all.
Regardless of the age issue - I remember Prof Robert Winston stressing that IVF is not a cure for infertility, and quoted the succcess rate I think as 1 in 6. I think the success rate is higher now. It was 1 in 6 when my son and dil were having IVF.
I have no evidence to back this up, but I do think that couples have an expectation that it will be successful and the awfulness of that not happening must be horrendous, especially for people who have had a great many cycles.
I think an important issue as others have said is the likely success rate of a woman over 40 having a live birth and I think it is 5% which is very low.
I suppose this outcome has to be measured against expensive drugs for cancer etc and these are often with held on the basis of whether the drug is in fact going to extend life to a significant degree. All kinds of decisions are being made by NICE and I think I err on the side of looking at outcomes and the 5% chance of a live birth for a woman over 40, and would therefore not be able to support the decision.
I am trying to be objective about a very emotive subject, which is very very difficult.
Curryeater I must take issue with you about your last para. I was a social worker and tm mgr for a LA Fostering & Adoption team and have seen the anguish of couples who are infertile and long for a child. You are quite right that older children are far more difficult to place than a baby, but there are very very few babies (without medical problems/disability etc) available for adoption, as these days single parents are able to keep their babies.
I think you are maybe unclear about the reasons why children are removed from parents, which is understandable, but you say it is "tricky, because how do you make the judgement that someone is not good enough to keep their baby and give it to someone else - posher and richer." I don't want to go into much detail because it is hi-jacking this thread, but believe me a huge amount of work by many professionals are involved in care proceedings for a child and the judge makes the decision at the end of the day. Also careful matching takes place between prospective adoptors and children, rather than "giving it to someone else"