The BBC recently ran an interview with Susan Tollefsen, a British woman who gave birth to her first daughter at age 57 in 2008. The baby was conceived with the help of in vitro fertilization, using a donor egg and her partner’s sperm (although the couple is now separated). Ms. Tollefsen was refused fertility treatment in the UK because of her age, and became pregnant with the help of a clinic in Russia. Two years later, a clinic in London agreed to assist her with a second pregnancy, but she ultimately decided not to follow through, citing potential health concerns. […]