Resume/CV - How far back can I go

[cbx2v]

I'm applying to the Harvard Kennedy School and they want a weird hybrid resume/CV that's two to four pages in length. I want to highlight some of my leadership positions, but I've only been out of college for four years and I'm a little sparse in that area, especially on positions with fancy sounding titles. I am the low man on the totem poll at my job (research and admin at a highly regarded think tank/magazine). Should I include leadership positions I had in college or would that be going back too far and make me sound a bit juvenile?

Another question-- Just last month, I was picked to be a board member of my local PBK chapter. However, since this just happened I haven't really done anything yet and I'm not even up on the website as a board member. Is it worth it to include?

Thanks!