proc sql;
  create table pairs_sql as
    select y.Name, y.Age, o.Name as NameOlder, o.Age as AgeOlder
      from sashelp.class y, sashelp.class o
      where y.Age lt o.Age
      order by Age, AgeOlder, Name, NameOlder;
quit;
proc print data=pairs_sql(obs=20);
  by Age AgeOlder;
  id Age AgeOlder;
  title1 "Student Mentor Pairings";
run;