I suspect that someone has simply misread a recent news item reporting that Clint was "surprised to become a dad late in life," i.e., when he was 66 and found out that his new bride was pregnant.
http://www.imdb.com/news/ni0618967/http://www.clinteastwood.org/forums/index.php?topic=7063.msg129949#msg129949This was an advance tidbit from the upcoming
Parade interview, which is now available online. The quote goes like this:
By 63, having sired six children by four women, Clint was resigned to riding to the end of the trail solo. Then he was interviewed by a TV reporter named Dina Ruiz. She was 35 years his junior, a beauty of Japanese, European, and African-American descent. Their chemistry was instant.
If Clint surprised himself by marrying again, he certainly didn’t imagine more kids. “We were in Hawaii on our honeymoon,” he tells me. “After a few weeks, she said she felt a little nausea. She asked me to stop at a gas station so she could buy one of those sticks. She came back and said, ‘We’re pregnant.’” He laughs. “At least nobody stood there with a shotgun when we got married.”
http://www.parade.com/celebrity/2008/12/clint-eastwood.html 
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