NEW YORK, USA (AP) — He has lived many, many Sundays.

Turning 65 next year doesn't only mean more nap time for Billy Crystal. The actor and comedian is transforming the milestone into a book, and maybe even a stage show.

Crystal has an agreement with Henry Holt and Company for a book that will be part memoir, part meditation — with jokes - about getting older. Financial terms were not disclosed, but an official with knowledge of the negotiations said the deal was worth around US$4 million. The official was not authorised to discuss terms and spoke on condition of anonymity. Multiple publishers were interested in the book.

During a recent telephone interview with The Associated Press, Crystal said that he hoped to have it out around the time the big day arrives, March 14, 2013.

"There are 77 million of us baby boomers in the country and this book will speak to them and how we look at the world," he said.

The book is currently untitled: "We have a dirty title, and a sincere title," he explained. Crystal said he expects to work on it throughout the summer and have the manuscript done by the beginning of November. He's considering adapting the book for the stage. Crystal had enormous success with the Tony Award-winning "700 Sundays," his one-man theater show that paid tribute to his late father with whom Crystal has said he spent 700 Sundays. Crystal has written several previous books, including children's stories and an adaptation of "700 Sundays."

Crystal has made a career out of turning his life into comedy. "City Slickers" was a story of mid-life crisis, and an upcoming film, "Parental Guidance," stars Crystal and Bette Midler as grandparents, based on Crystal's experiences with his own grandchildren. He is one of the world's busier almost-senior citizens, also working on a prequel to "Monsters Inc." and a possible candidate for another shot at hosting the Oscars.

The new book will be around 300-350 pages ("the print will be four inches high") and will be edited by Gillian Blake, who worked on Rob Lowe's best-selling "Stories I Only Tell My Friends." In a statement released by Holt on Wednesday, Blake said that "It's not every day you laugh out loud at your desk while reading a book proposal."

Crystal said he was currently breaking down his life into decades: "My 20s and 30s and 40s and 50s."

He stopped and laughed. "That's a lot of decades."