fill up missing values

[ydu180]

Does anyone know how to filling this missing values? I have information to fill, but I don't know how to locate these three and then assign, as other variables are the same.

[RW9]

data want;
  set have;
  if athlete="" then do;
    athlete="abc";
    age=21;
  end;
run;

[ydu180]

How could I do if three missing Athletes have different age?

[RW9]

You need to provide some information on what you are doing I can't guess.  Post test data in the form of a datastep, post example output that you want, explain the logic between the two.

[ydu180]

The first one is my results, there are three missing value. The second is the information. I need to find the three and three them up.

[RW9]

And how do I know that row 4009 should contain <insert correct data>?  And how to know the row 4010 should contain <insert correct data>?