Making the Jump; and having all my Game Data Come With

Hello, OK, so as a two-time iphone owner, I should be used to this by now, but I'm going to ask a very unApple like question. I do not use game center; I am just not interested in the social aspect and have never bothered to create an account. So barring that in mind, will my game data be lost when I update to iOS 7? Ordinarily, I wouldn't care, but I have amassed quite a collection of gold and treasure trove of words in Solora and iAssociate II. :) I know there are options to restore in-app purchases, and I think they will need to be restored since iCloud just redownloads the apps, but will I have to solve all those levels again? Or should I just bite the bullet and apply for a game center account? I kind of have a minute to upgrade now, and the suspense is killing me!