Off-topic but it seems that a change to upvoting has recently been implemented: https://news.ycombinator.com/voteclosed?id=11923301&how=up

We used to be able to upvote old items but now it seems there's a limit on that too. Too bad, I always liked being able to express that I enjoyed discovering something old in someone's record of contributions, even if no one would notice my upvote.