Glen Campbell. (Dan Steinberg/AP)

“I have been blessed,” the musician told ABC’s Terry Moran in an interview. “I really have. I figured it out that I’m not that bright, but God gave me a break.”

In Campbell’s first TV interview since going public with his Alzheimer’s disease diagnosis, the “Rhinestone Cowboy” singer seemed in good spirits despite having to struggle for words at times.

The musician told Moran he hasn’t “felt it yet,” referring to the degenerative disease.

“I've always been forgetful anyway. I’m only what — 78?” His wife Kim Wollen helpfully corrected him: “75.”

“Oh, so I’ve got a couple more,” he joked.

Wollen sat at her husband’s side as she helped him answer certain questions. Campbell recognized how lucky he was to have her, even if he couldn’t remember some of the details of their courtship. “Did you find me or I find you?” he asked his wife. “I think we found each other,” she said.

The musician will release his final album, “Ghost on the Canvas,”at the end of the month and plans to go on tour to say farewell to his fans. Supported by a band featuring three of his children, Campbell will begin the tour in Toronto at the end of August.

Indeed, it was when Campbell picked up a guitar and began to play “Wichita Lineman” that he seemed at his best: “Oh, that’s a great song.

Watch parts of the interview from ABC’s “Nightline” and “World News Tonight” below.