what age does down syndrome show up
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.s many as 80% of adults with this condition reach age 55, and many live longer. The most common form of Down syndrome is often called  trisomy 21, because individuals with this condition have three copies of the 21st chromosome.