Then we read things about women in their 50s who had had children and thought that might be a nice way to do it. I know people may criticise us, but we've thought about this carefully for years. They decided to go ahead with the treatment at the Harley Street clinic after suffering two miscarriages and the birth of stillborn twins. If we set an age limit of say 55, we would be saying that all women of 54 were medically suitable to have children, and that's clearly not the case. Eggs from a donor woman were implanted into Mrs Bezant's womb and a blood test three weeks later showed she was pregnant.
Doctors also have to weigh up the risks to a woman's health of pregnancy late in life.
And decisions like these can only be made on a case by case basis.