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In the US, between 1979 and 2003, live birth prevalence increased by 31%, from 9.0 to 11.8 per 10,000 live births. People with Down syndrome are also living longer. Improved medical care in developed countries is now helping people with Down syndrome to live beyond 60 years - up from only 30 years in the 1970s. It has been estimated that there were 83,400 children and adolescents living in the USA in 2002.
Dr. Gass: Babies conceived by older mothers are at a much greater risk for Downâs syndrome: At age 40, the risk is 1 in 100, which is 10 times higher than the risk of a 25-year-old (1 in 1250). By age 49, the risk is 1 in 10. Factor in other birth defects or chromosomal abnormalities and the risk increases even more.