Over the past 40 years, the number of women giving birth at age 35 or older has increased significantly, both in the United States and globally. In the U.S., this trend began in the mid-1970s and continues today. In 2018, about 18% of women giving birth were over 35, compared to just 8% in 1990. What’s even more striking is that this number is steadily rising. In contrast, birth rates among teenagers and those in their twenties have reached record lows. The trend toward later parenthood is not...