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Generally, the older a father’s age, the greater the risk, researchers at Stanford said.

STEPHEN: At an impressive 83, Al Pacino looks set to join his former The Godfather II co-star Robert De Niro and become a new dad in late-late life.

At the ripe old age of 79, Robert De Niro has become a father - again. The now seven-time dad has sired daughter Gia Virginia with Tiffany Chen - a mere whippet of a thing at 45.

Americans were smokers. if you have seen "mad men," you know that is true. in the past 12 years the number of younger smokers has fallen dramatically. a new study from the journal "nature" is shedding light on the mystery behind autism. it turns out the age of the father, it is a key factor in whether a child develops this disorder. abc's medical editor, dr. richard besser, has all the details. >> reporter: autism, one of medicine's greatest puzzles, has some new math, about older dads. dads like ray siegel. >> let's figure out if there is a genetic factor. >> reporter: his sons oscar and hu...

>> oh, yeah. >> in the past 12 years, the number of younger smokers has fallen dramatically. a new study from the journal "nature" is shedding light on the mystery behind autism. it turns out the age of the father, it is a key factor in whether a child develops this disorder. abc's medical editor, dr. richard besser, has all the details. >> reporter: autism, one of medicine's greatest puzzles, has some new math, about older dads. dads like ray siegel. >> let's figure out if there is a genetic factor. >> reporter: his sons oscar and hugo are both autistic. for the first time, researchers are ...