for me, old posts have no value.
whatever, anyone individual said a week or year ago really doesn't matter. it's fairly easy to wiggle out of a past take.
the only time an old post is even a thought, is checking via search, to make sure your not starting a duplicate thread.
not sure you asked this, but keep the shout box.
do not reset an individuals post count. it helps with credibility by knowing a newbie vs long time member.