The subject of this study, the Ashkenazi Jews, have the highest IQ of any other group of people in the world.
80% of the Jews who have immigrated to the US are Ashkenazi Jews.
But “We found that for each year the father is older, at birth the child has on average 17 bp longer telomeres.” according to http://hmg.oxfordjournals.org/cgi/content/full/16/24/3097
We need more research.