With the exception of the 45-64 (yellow) and the 65+(aqua) the trends seem to be headed downward. What this suggests is disenfranchisement on a major scale.
Maybe candidates just aren't striking a chord with voters anymore or voters are giving up on their ability to affect change with their votes as elections come and go and things remain the same.
Just a test since I can't 're-fresh' the page and see any comments since mine at #8. Don't know why, but I'm about to give up (apathy) like an 18-24 yr. old voter.