Ignorance is bliss. Turns out I've been driving around with an expired license since my birthday in May. The pollworkers noticed it today when I presented it to vote. Whoops.
Now that I know, I am going to be paranoid until I get it renewed. Which I could have done over the internet, very conveniently, on time, if Georgia had mailed my renewal notice to me like they were supposed to. They probably sent it to my former address. (Yes, I updated my address with them two years ago, but this is the DMV we're talking about.) If they did, I hope those renewal reminders do not contain any useful personal information, and that no one is driving around with my new drivers license.