Michele, I was 36 years old when I had my youngest child. I refused all of the tests because I wasn't going to abort my child anyway; no matter what. But, everything turned out just fine and my son was born without any problems at all.
A friend of mine who I went to school with, also had a baby at that age. (Same time as me.) This woman had high blood pressure and it was a difficult pregnancy, but everything turned out perfect.
I know it's impossible not to worry, but try to stay positive. Terri