Why are the GAM age groups ambiguous, instead of referring to specific ages, e.g. 0-5?

A:   It is for each Agency and/or Cluster to inform its partners about the specific age breakdowns required for their projects.  Age categories are different for different organizations, so the GAM uses broad age group descriptions instead.  This allows comparison and analysis beyond the agency or cluster level.   While the GAM only looks at generalized age groups (younger, older, etc.) the cluster is likely to expect a more detailed breakdown in project documents.