But today's study by Stanford University, which looked at 40 million births between 2007 and 2016, is the first major piece of long-term research to look at older fathers.
Daraasadan cusub oo lagu sameeyay Jaamacadda Stanford ayaa lagula socday 40 milyan oo dhalasho mudada u dhaxeysay 2007 ilaa 2016- waana daraasadii koowaad ee ugu horeysay muddo dheer oo baarta waalidiinta da'da weyn.