This is probably a general observation that you may have already noticed, but there are definitely more twins being born today than in the past. A report from the National Center for Health Statistics found that twin births are up in all age groups, across all races in all states. Overall, the twin birth rate jumped from 18.9 in 1980 to 33.2 per 1,000 births in 2009. The numbers are get even more skewed for older mothers. Among women 35-39, rates rose by nearly 100%, and among those 40 and over, rates rose more than 200%! Not shocking, the report suggests that fertility treatment provides the backdrop this increase, however older age already predisposes women to giving birth to twins. A spokesperson for the Center for Disease Control, says that older age accounted for roughly a third of the increase, while fertility treatment accounted for the other two-thirds. Twins now make up 3.3% of all births, up from 1.9% in 1980, but the study shows that twin birth rates slowed from 2005 to 2009. You can read the full article at USA Today.