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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.
Though Down syndrome babies may be born to mothers of any age, they are more frequently born to older mothers. At the age of 20, a mother has 1 chance in 1,667 of having a child with Down syndrome; at the age of 35, she has 1 chance in 385; at the age of 40, she has 1 chance in 106.or example, the average woman at age 30 ovulates 13 times a year; by age 40, she may ovulate only 5 or 6 times a year. Older women are also more likely to have problems with their reproductive organs, which may prevent pregnancy from occurring.