Since you say it would "just as useful to me", then I would assume that means it doesn't have to do with the actual person who submitted it (and correlate to age, or something) because you couldn't do that (easily) without a name attached.
Couldn't you then, in that case, give each anonymous user a number, and say "Anonymous User 1"? On the other hand, given that it might be possible to reverse it to the user who made those upvotes.