This should give you the information you need. It is different for every state so since I don’t know your situations and the laws in your state that is something you must look into yourself. Some states do allow you to get a highschool diploma at your age and others only offer the GED route.

btw, good for you. It’s never too late. My own great-grandmother got her diploma at the age of 78 or something like that in the 1980’s. If she could do it, I’m sure there’s something out there for you.

http://www.edanywhere.com

http://www.scahomeschool.com

While they don’t advertise it too obviously on their websites, all of these schools will accept an adult for enrollment, your other option would be to go to your local Community College and find out about their adult diploma program, some even have distance and independent study plans.

What you prefer and what has legitimatcy are probably different. I would not do an at home program – they at this level will be looked upon skeptically.