Down syndrome is caused by the presence of all or part of a third copy of which of the following chromosomes?

People with Down syndrome also seem to be blessed with a bright kindness of spirit that is infectious.

I have worked with many Downs Syndrome people in my time working with the intellectually handicapped. Unfortunately, many decline and pass away while in their 50s. I believe the oldest Downs Syndrome person I knew was 65 years old.

KittyA9, over age 35 is considered geriatric pregnancy in United States.

KittyA9, it has been!

PhoenixGriffin911, You may be wrong!

PhoenixGriffin911, women conceive too young? Please, explain further!

Player #62752956, Which draws individuals to take advantage!

Deborah , I'm quite sure I may be known at 69. Healthy and sharp enough!

PhoenixGriffin911, yet more and more people are having kids into their 30s and 40s

another genetic disorder that happens on chromose 17 is Neurofibromatosis Type 1. 50% of cases are genetically handed down and the other 50% of cases are spontaneous mutations of the chromosome

Deborah , challenged not handicapped.

HOW R WE SUPPOSED TO KNOW THAT

It would be helpful if the advanced age of the mother was noted.