George and Amal Clooney are expecting twins this summer, making the couple part of a growing trend of people becoming parents at older ages in the United States. According to the Centers for Disease Control and Prevention (CDC), the average age for first-time mothers in the United States is 26.3, according to data collected in 2014. However, the percentage of parents in older age groups — in particular, older moms — is on the rise.
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