I believe KL says to “wake the dragon, one bill at a time”

In other words, don’t disturb those dormant old debts until you’re in a position to pay for them right then and there. By the time you’re ready to deal with them, they are equally as ready to settle at a percentage of the original debt and you should get in writing that settlement agreement, and mail off payment to them in exchange.
I would start looking for them on your credit report, and once you wake up one, the others will soon follow in locating you, but by that time you should be ready to deal with them quickly.