Retirement is a myth.

The human mechanism will not allow you to retire, Letterman toldGQ.

As long as you are healthy, you still want to produce, he added.

David Letterman poses on a red carpet.

David Letterman attends the 92nd Street Y presents Senator Al Franken in conversation with David Letterman on May 30, 2017 in New York City.Andrew Toth/FilmMagic

And without the rhythm that youre accustomed to, largely unsatisfying.

So you got to find something thats important to you.

Like I said, Im surprised at the number that Im still doing it at now, he explained.

David Letterman Joe Biden fundraiser

Norm MacDonald, David Letterman on the Jan. 7, 1998 episode ofThe Late Show with David Letterman(CBS/Courtesy Everett Collection)

I think if I start in the middle of talking to a world famous guest I fall asleep.

I was doing some show for Netflix a couple of years ago, and the schedule was ridiculous.

We were doing three shows a night, twice and then three shows another night twice.

And it was just insane.

Maybe thats a sign, said Letterman.

Letterman has hosted his Netflixtalk showsince 2018, debuting Season 5 this June.