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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 im 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. >> theres optimism that maybe well figure out whats actually behind it. >> nice save. >> thats what i meant to say. >> genetic researchers now say the age of the father may increase a childs risk for autism. abcs...

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 dont have the answer. we have...