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

Rev. 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. "He's not offering political advice, but he will offer spiritual advice to anyone who comes to him," says Franklin. "He's in pretty good health. His mind is just as sharp as a tack."

Billy Graham's glib father-son advice, according to Franklin, was: "Don't get old."