>Each component has different weights:
>https://www.myfico.com/credit-education/whats-in-your-credit-score
>
>So when you paid off your student loans, two components in the
>score were probably negatively affected: length of history and
>credit type mix.
>
>It's likely that the student loan was one of your longest
>running accounts. So paying that off could bring the average
>age of your existing accounts way.
>And if the student loan was your only no-credit card type of
>debt, then your score will be negatively affected after paying
>it off since you no longer have installment loans on your
>history.
>
>It's a dumb system, but that's just the way it is. But I
>wouldn't worry about it unless you have immediate plans to get
>new credit (car loan, mortgage). You score will eventually go
>back up if you keep doing the right things.