Reagan is hailed as one of the greatest Presidents in history, and he was two years younger than McCain is now, 27 years ago. So, in essence, Reagan was probably mentally and physically older than McCain, because of medical and lifestyle improvements over the last 27 years.
BTW, I take Ambien. I've never woken up drowsy or suffered hallucinations. I'm also not taking Ambien with Phenergan (which also causes drowsiness) while drinking alcohol and trying to drive, like Patrick Kennedy. And neither is McCain.
Kennedy was also known for an addiction to OxyContin and cocaine. You really wanna compare that to McCain? Go ahead.