This question already has an answer here:
So now and then I stumble upon an older question which is essentially a duplicate of a yet older and/or more popular/canonical question. Today's example is What's the difference between RequestDispatcher.forward() and HttpServletResponse.sendRedirect()? which is the nth duplicate of RequestDispatcher.forward() vs HttpServletResponse.sendRedirect().
However, I can't vote for close because of a close vote I've already cast five years ago.
You voted to close this question Aug 28 '11 at 13:26
Based on those related meta questions Why do old expired close votes prevent me from ever voting to close again? and How do close votes age away? they should have aged away long ago.
This is not the first time I'm seeing this. It seems that aging of close votes doesn't work very well for "very old" questions. At least, I don't remember seeing above message on a question posted after about 2012.