In my opinion, results or performance in the past 1 or 2 years can still be treated as old stats, though it can be useful but some people prefer to use just a one year stats or the statistics of that current season. There was a topic created last week about using recency stats and I think someone made a comment in that thread stating that they only uses the most recent performance or changes in the team's previous 1 or 2 match to make prediction of the next match outcome. Simply means that different bettors have option they explore and it works for them.