This is kind of late but...I'm 53, gay and single. I adopted my first child 4 years ago and am starting the process to add to my little family. I'm a foster/adoptive parent in AZ so our laws are pretty broad.
You can adopt at any age! You can usually apply and social services are sent to see if you are fit and able to be a mother. Just basic routine checks like cleanliness, some health questions etc. You should go for it! I myself am an adopted child and I have the best parents in the world. It surely is the best feeling in the world to adopt a child! Good luck with everything :)