Here's a start for you. Definitely needs some customizing.
proc sort data=sashelp.class out=class;
by age;
run;
data class_list;
set class;
by age;
if first.age then
y=0;
y + 1;
run;
PROC SGPLOT data=class_list;
scatter x=age y=y /
FILLEDOUTLINEDMARKERS
markerattrs=(symbol=circlefilled size=20)
markerfillattrs=(color=blue);
yaxis values=(0 to 10 by 2);
run;
quit;
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