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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.
At age 25, a woman has a one in 1,250 risk for having a child with Down syndrome. The risk increases to one in 952 at age 30, to one in 378 at age 35, to one in 106 at age 40 and one in 35 at age 45. However, 80% of children born with Down syndrome are born to mothers under the age of 35.This is because most babies, in general, are born to younger women.sually, children born with the condition have some degree of mental retardation, as well as characteristic physical features. Many of these children also have other health problems. Each year in the U.S., approximately one in every 800 to 1,000 newborns has Down syndrome.