ive heard differently on that age affiliation and downs syndrome...but what you stated was what i always heard too.. i'll see if i can get the info that suggest that 35+ isnt the factor it was once percieved to be...
Graph showing increased chance of Down syndrome compared to maternal age.The incidence of Down syndrome is estimated at one per 800 to one per 1000 births.[12] In 2006, the Center for Disease Control estimated the rate as one per 733 live births in the United States (5429 new cases per year).[13] Approximately 95% of these are trisomy 21. Down syndrome occurs in all ethnic groups and among all economic classes.
Maternal age influences the chances of conceiving a baby with Down syndrome. At maternal age 20 to 24, the probability is one in 1562; at age 35 to 39 the probability is one in 214, and above age 45 the probability is one in 19.[14] Although the probability increases with maternal age, 80% of children with Down syndrome are born to women under the age of 35,[15] reflecting the overall fertility of that age group. Recent data also suggest that paternal age, especially beyond 42,[16] also increases the risk of Down Syndrome manifesting in pregnancies in older mothers.[17]
Current research (as of 2008) has shown that Down syndrome is due to a random event during the formation of sex cells or pregnancy. There has been no evidence that it is due to parental behavior or environmental factors.
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