Why doesn't Howard know his own age?

Listening to a show from the Artie era and Howard is talking about a Valentine's Day party he threw. He mentions inviting the radio DJ Carol Miller and says "I remember listening to her when I was a kid."

Carol Miller was born in 1950. Howard was born in 1954.

She didn't even make her radio debut until 1973.

This is the same guy who says he watched Charlie's Angels as a kid. That show came on in 1976.

And he claims to have listened to Metallica in high school. Metallica's first album dropped in 1983, when Howie was at the tender age of 29.

Is this a mental illness, or is he so full of shit that he lost track of space and time?