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Researchers then extended that another generation: The older your father's father was when your father was born, the longer your telomeres tend to be. That analysis included 234 grandchildren. A separate analysis found no significant effect from the mother's father. The telomere contribution from a grandfather adds to the one from the father, researchers found. Some previous studies of the impact of older fatherhood have been less encouraging. In 2010, for example, at least two big studies confirmed a link to having children with autism, with one finding that a father's age makes the biggest difference when the mother is young. In 2008, a big Swedish study strengthened evidence linking bipolar disorder to older paternal ages, although researchers said the risk was still so low that it shouldn't discourage older men from having children. ___ Online: Journal: http://www.pnas.org/
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