According to the CDC, Down Syndrome is the most common chromosomal disorder. Each year 6,000 babies are born with Down syndrome which is estimated to be about 1 in every 700 babies. Here is a timeline showing Down syndrome progression over the years:
Down Syndrome Timeline
1866- British Physician John Langdon Down, first described the genetic disorder as “Mongoloid” based on patients similar characteristics.
1876- An initial association between premature “senility” and Down syndrome is discovered.
1929- Life expectancy is approximately 9 years of age
1932- Abnormal distribution of chromosomes was first suggested as the cause of Down syndrome.
1946- Life expectancy is approximately 12 years of age.
1948- Evidence between Alzheimer’s and Down syndrome is first published.
1959- Dr. Jerome Lejeune discovered Down syndrome is the result of an abnormality in the chromosomes.
1959- The term Trisomy 21 is used on the medical community to describe Down syndrome.
1960- Researchers discover a type of trisomy called translocation
1961- Researchers discover a type pf trisomy called Mosaicism.
1965- The World Health Organization (WHO) accepts the name Down syndrome as the standard name to use.
1970- Life expectancy is approximately 25 years of age.
1976- Amniocentesis comes into common use in the United States
1987- A gene associated with Alzheimer disease is discovered on Chromosome 21
1994- CDC announces he prevalence of Down syndrome from 1893-1990 was 1 in 1087.
1997- Life expectancy is approximately 49 years of age.
2006- Life expectancy is approximately 60 years of age
Centers for Disease Control and Prevention
Global Down Syndrome Foundation