A good way to help old content "decay" is to multiply the votes/relevance by the current timestamp (which is always greater than previous timestamps). If you, s

A good way to help old content "decay" is to multiply the votes/relevance by the current timestamp (which is always greater than previous timestamps). If you, say, round to the nearest hour -- then there would be an inflection point come the next hour when a 59 minute turns into a 60 minute old post and gets its point total multiplied by a smaller bin than posts coming in during the current hour.