Is it possible that Ant is suffering from alcohol induced dementia?

One hallmark of dementia is that you can still remember things from 20 or 30 years ago, but you have difficulty absorbing anything new. Perhaps the constant references to TV, movies and music from twenty years ago is because he's incapable of remembering what happened yesterday.

Korsakoff syndrome causes problems learning new information, inability to remember recent events and long-term memory gaps. Memory problems may be strikingly severe while other thinking and social skills are relatively unaffected. For example, individuals may seem able to carry on a coherent conversation, but moments later be unable to recall that the conversation took place or to whom they spoke.

Those with Korsakoff syndrome may "confabulate," or make up, information they can't remember. They are not "lying" but may actually believe their invented explanations. Scientists don't yet understand why Korsakoff syndrome may cause confabulation.