I no longer do a second take when I read news that a woman in her fifties has given birth. This month alone, Victoria Coren Mitchell, 51, announced the arrival of her second child with her partner, the comedian David Mitchell, who is 49. Tana Ramsay, who turns 50 next year, welcomed her sixth child with that gobby 57-year-old chef husband of hers last week. Then there’s Hilary Swank, Janet Jackson, Halle Berry, Laura Linney et al, all who’ve had babies in their very late forties or early fifties.