The story of Elizabeth Adeney, a 66-year-old divorcee who travelled to the Ukraine for fertility treatment, resonated around the world. Her critics claimed it was unnatural, that she was putting herself and her unborn child in danger, and that she was ignoring the rights and needs of her (soon-to-be orphaned) son. Allison Pearson declared the image of her with her son "a sickening picture that makes me shudder." But support came from unlikely places. Boris Johnson, for example, exclaimed "Britain's oldest mum deserves congratulations, not disapproval." Now that we're living longer, now that women are approaching equality in their work lives, doesn't the world need to get rid of their prejudice against older mums? But how do we decide how old is too old? And what about the rights of the unborn child? It's the mother of all arguments (apologies). Here, Amanda Blue meets four women who have decided to take advantage of developments in fertility treatments and have children later in life - despite their combined age exceeding 280.