Anyway to automate old retweets?

I want to make a few accounts look aged, so I want to retweet old tweets to fill up the account. Is there anyway to do this in an automated way? tweet adder lets you retweet automated but only new tweets.

I have a program that can help on this for a small fee.

Hey there.. Ive been coding twitter since the past 2 years. Mainly PHP applications.
If you know how to code, then prepare a tweet grabber and add it to a mysql database, then do cron jobs to post tweets from your db and mark them as posted on your account.
You can do this with multiple accounts and API. Its kinda hard but you get the point.
Also you can use the tweet grabber for free, check my signature.
And for the tweets automatic I have to add that feature to a program I have for private. PM if interested.