PHILADELPHIA (CBS) — William Shatner says he is still going strong and happy working at the age of 85 as he debuts a new book and is coming to Philadelphia to perform again.

Shatner, in an interview with Chris Stigall on Talk Radio 1210 WPHT, says staying active is what comes natural to him.

READ MORE: Philadelphia Weather: Heat Advisory In Effect As Temperatures Hit Record Highs On Saturday

“I’m like an old war horse I guess. You know, I got on a horse, an old horse that I haven’t been on in a while, but she was really well trained and every cue that I gave her…she responded like time hadn’t passed. I’m being cued by my psyche, I guess, and here I am, performing and making you and other people laugh and entertaining them. That’s what I do.”

The famed actor said his success is one of the factors that pushes him to keep going.

READ MORE: Suspect Surrenders After Firing AK-47, Shotgun At Bensalem Police During Barricade Situation, Officials Say


“If you’re working and you fail, I guess you don’t want to work anymore. But, If you’re going along, I’m at the Keswick, a one man show, I’ve got a book debuting this week called Zero-G, a really fun science fiction read. I’m in the middle of everything and it’s fun.”

His show, ‘Shatner’s World,’ will be at the Keswick Theater in Glenside on October 13.

MORE NEWS: Where To Find Cooling Centers In Philadelphia This Weekend