Twin births highest for women 50-54
In 1999 however, twin birth rates rose steadily with maternal age and were highest for women aged 50-54 years. Since 1990, the twin birth rate has risen 80 percent among women 40-44 years of age (from 24.7 to 44.5 per 1,000), and almost 600 percent among women aged 45-49 years (from 23.8 to 155.7), compared to only a 6 percent rise for women under age 20 years (14.3 to 15.2).
Comparable trend data are not available for women aged 50-54 years, but in 1999 more than a third of births (34 percent) to women in the oldest age group were born in a twin delivery.
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