Not sure what point you are trying to make here. Median voter age isn't much of a measure of anything without some indication of variance, and numbers in each age group. It's well known that actual percentage voting is higher among people over 65 than among under-25s, and the difference isn't small.

Conservatism is bad and we have to defeat the freaks in the GOP, but we can’t think about the government and how to fix it without acknowledging what is actually happening.

When you know this, and know that the overwhelming victory in most recent Presidential Elections is "None of the Above" it really makes the Democrats' refusal to stop moving right seem even more idiotic and evil.

Eligible or actual?

Actual.