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Stars get on there. they blow up, get a hit movie and say, i can make more money on the big screen and i'm out of there. >> or they get a talk show. >> you never know. path to stardom. first, unraveling the complexities and causes of optimism. >> autism. >> what did i say? >> optimism. >> there's optimism that maybe we'll figure out what's actually behind it. >> nice save. >> that's what i meant to say. >> genetic researchers now say the age of the father may increase a child's risk for autism. abc's medical editor dr. richard besser has details. >> reporter: autism is one of medicine's grea...

And maybe a little more common in older dads. >> reporter: dads who were over 50 when compared to dads under 30, have twice the risk of having an autistic child. and this study may help explain why. pointing out spontaneous genetic glitches connected directly to autism. medicine already knows that older parents, moms and dads, have a higher risk of having kids with downs syndrome, schizophrenia and bipolar disorder. the older the parents, the greater the risk. >> we don't have the answer. we have lots of answers and lots of suggestions. this is often the way with interesting science, it raises...