BOONE, N.C. (AP) _ The Reverend Billy Graham has retired from preaching, but the 91-year-old evangelist is still writing books and offering spiritual counsel to callers and visitors.

The Reverend Franklin Graham says his father has spoken on the phone in recent months with President Barack Obama and former President George W. Bush, and was visited by former Alaska Gov. Sarah Palin.

The younger Graham says his father recently finished updating his 1992 book “Storm Warning,” and is currently working on another book, but slowly — typically an hour of work followed by a nap.

Billy Graham’s glib father-son advice, according to Franklin, was: “Don’t get old.”