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You won't get paid by the Steem blockchain after 7 days, but an upvote will positively effect your reputation score.

what effect does a higher reputation have other than bragging rights?
I am curious, thank you for the information.

I think steemit uses reputation scores to hide poor quality posts.

yeah I want to know how this works.. Like say you make the post and its so dope it gets listed on the serps but its after a week. Say im a whale and find it after a week from a search engine and I upvote it.. Do I get a payout from that whale upvote or after 7 days is the article oayour void. If its void then thats some booty.

You won't get paid for the upvote that occurs after 7 days, but your reputation score will be positively effected.

So, there is no rewards in circulation when older posts are voted, right?

That's correct, rewards are unaffected.

Does it affect your voting power, though, when you upvote old posts, or can you go around and upvote millions of old posts at full power without it diluting your ability to vote on new content?

Yes, it does cost voting power.

If it does cost voting power - where then does the reward go that have been created?

What if an 8 day old post gets a new comment. Does upvoting the new comment in an old post result in curation reward?

It will result in a 25% curation reward for the user who voted that comment, and a reward for the person who wrote the comment.

Does the comment have its own reward window? Is it separate from the reward window for the post (that already ended)?

Yes, the reward window is separate at it pays out 7 days after the comment is made.

Now I understand a lot more about the curation reward process. Previously, it deterred me from voting and commenting on posts older than 7 days.

Have you got an answer for this question? I have been wondering this myself.

There are no direct rewards after the 7 days. But you can get followers, comments or post links to refferal programms.

Exactly, that is what I was searching for hours and I tried to upvote the posts, but for 7 days or more old posts nothing is changed in rewards. This is an essential aspect of steemit that I think it is better for newcomers to know.

You are totally right, I have certainly upvoted some things that havent counted. When now we can right messages and then maybe the upvote would ount