Now, I may get the point. Try again, please.

proc sort data = sashelp.class out = temp01;
        by age;
run;
data _null_;
        format age_list $100.;
        if _n_ = 1 then do;
                dcl hash h();
                h.definekey("sex");
                h.definedata("sex","age_list");
                h.definedone();
        end;
        set temp01 end=eof;
        if h.find()=0 then do;
                if find(age_list,compress(age)) = 0 then do;
                        age_list = compress(age_list||","||age);
                        h.replace();
                end;
        end;else do;
                age_list = age;
                h.add();
        end;
        if eof then h.output(dataset:"temp02");
run;

Maybe the following code would be a little help.
proc sql;
        create table temp as
        select sex, age, count(distinct age) as number
                from sashelp.class
                group by 1, 2;
quit;

谢谢楼上，为什么group by 1,2 行，group by sex不行呢？

我的实际数据n多分类呢

不对啊，我的目的是想把男性的所有年龄取值读到一起，例如：

F 11,12,13,14,15