I just passed my sixth anniversary earlier this month. Unless things take a strange turn, I don't see why I wouldn't still be around for the run up to 2016. J-Mann makes a good point. The pace of one's posting may contribute to one's experience on the Atlas, and whether or not to keep going.
I wouldn't be surprised if I am still posting in some capacity. I was here five years ago, after all.
True, but look at all the people who have already been here for 5+ years...if they're still here they will have wasted a decade of their lives on Atlas.
Some of us have been around a long time, but as to whether or not we've wasted our lives is determined more by our post count and time logged in, rather than when we first registered. I know plenty of posters who registered years after I did but have racked up thousands of more posts and are literally wasting their lives here.