Almost give up

I had a miscarriage in Feb. It was 5 weeks old. I tried so hard to conceive again but I'm kinda give up. I'm 40 this year and I do not know if it's possible to conceive at this age. I read that it might be difficult for a woman in her 40s to give birth etc. I'm really kinda confused. To have an adoption, there are so many requirements etc.