By writing code.
Notice how the quality of the answer directly reflects the quality of the question. There is guidance provided just below the Post a Question button. Post example test data in the form of a datastep, what the output should look like, any logic in between, what you have done, what log outputs there are if necessary showing errors/warnings etc.
A quick point, whay create a macro for age grouping? Surely a simple if then statement in a datastep, or a format would be much more appropriate.
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