No, you've got it backwards... Age-5 is the maximum EDU can be to start with, not the starting value for EDU.
The reason EDU didn't have a starting value suggested was to allow the GM to set it to an appropriate value for the campaign. That way, in a campaign where the GM says "You're all professors at M.I.T.", one of the players doesn't create a character with an EDU 7, or the converse where the PCs are all grade school kids and one of them rolls an 18 for EDU.
If you don't have a strong preference, then start it at 10 with the other characteristics.
I'd make each EDU point cost 3 points and bump up the starting number of characteristic points by the following amounts:
Normal - Increase starting points by 6 (letting players add +2 EDU without affecting the way other points are spent, making a generic person a high school graduate or the equivalent) Heroic - Increase starting points by 12 (letting players add an average of +4 EDU, giving everyone a few years of college or the equivalent) Epic - Increase starting points by 18 (or +6 EDU, a college graduate or thereabouts) Superhuman - Increase starting points by 24 points (around +8 EDU, the equivalent of a M.A. or advanced degree)
Why aren't the extra point totals higher? The reason is that these points in EDU will double-dip, so to speak, adding more skill points. They also present the option of unbalancing starting point totals if they're not spent on EDU, so the GM should police how those points are spent.