For large stable populations, the fraction of school age, academy age, and workers (assuming that there are no patricians) should be about:
at below average health, school 35.5%, academy 13.8%, workers 28.3%
at average health, school 27.2%, academy 12.7%, workers 30.6%
at good health, school 24.8%, academy 12.0%, workers 29.8%
at very good health, school 21.8%, academy 10.9%, workers 28.1%
at excellent health, school 20.5%, academy 10.2%, workers 26.3%
at almost perfect health, school 18.4%, academy 9.2%, workers 23.6%
I don't think that a large population can be stable at perfect health or at poor or worse health.
[Edit: I used a programming system from Trium, modified, to get this data.][This message has been edited by Brugle (edited 07-21-2013 @ 02:52 PM).]