WASHINGTON — The children and grandchildren of men who reproduced later in life could enjoy life-extending genetic benefits, including being able to father children at an older age, a new study suggests. Researchers at Northwestern University believe the process represents an unusually rapid evolutionary adaptation in which telomeres -- DNA found at the ends of chromosomes -- lengthen, which is thought to promote healthy aging. "If your father and grandfather were able to live and reproduce at a later age, this might predict that you yourself live in an environment that is somewhat similar -- an environment with less accidental deaths or in which men are only able to find a partner at later ages," said Dan Eisenberg, lead author of the study. "In such an environment, investing more in a body capable of reaching these late ages could be an adaptive strategy from an evolutionary perspective." After analyzing the DNA of 1,779 young adults and their mothers in the Phili...