well longevity is fairly straightforward. just the percentage of the existence of the forum that your account has existed. As for activity I'm lost too...
its how often your on the forums. like if your stay logged in for a week and post often during that, you'll beat Jeb in activity ez
Longevity is what time you registered on the board in relation to its creation. Activity is a post % (how active you are on the board) for the whole course (i presume whole course). Today is your activity for today
the best way to raise your activity is to play a little game called, be the last poster on every post, EVER!
Great, another thing for people to spam about and try to one up each other... sigh, let the spamming begin.