Joe's been sober now...again...for about 10 years. He fell off the wagon once the Eagles re-united and began touring again. It's been a career long struggle with alcohol and other addictive substances for Joe and now that he's much older he's accepted the fact the stuff can control you, you just don't let it win.
He said he had to realize he was ready to get in control. I saw him in an interview and he said once his wife left him, he thought maybe it was HIM. ANd yes, the man can still play that rock and roll.