(John first became a father in 2010, and then again in 2013.)

I cant believe Im sitting in the car telling you this.

Its changed my life, John said of his kids.

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Credit: CBS

I thought I was too old to be a dad.

No, Im not too old to be a dad.

Youre not too old to do anything.

Those kids have changed my life completely; changed our life completely.

As the segment ended, John and Corden performed Dont Let the Sun Go Down on Me in unison.

Speaking to EW after taping the segment, but before it aired on Sunday,Corden made similar remarks.

Watch the full segment below.