New Facebook Friends, and Old Posts on my wall?

[:^)]

recently a few of my cousins added me on Facebook, but for privacy reasons, i want to hide my old wall post from them just so they wont be nosy enough to read my old post and figure out what guy am talking to, how i can i make this happen? meaning hide my old post from them and just show them my recent post. i know how to block them so they wont see my whole wall and how to hide them from seeing my new updated post, but is there any settings out there that can hide my old posts from them?

Thanx in Advance

P.S if your wondering why did i add them on the first place...
well..i just didnt wanna be rude lol