Many users really like the cleaner and flatter look of iOS 7.
However, if you are over 40, the lighter-weight Helvetica Neue font used throughout iOS 7 may be harder to read than the system font used in iOS 6. Fortunately, there are several settings you can adjust to make the iOS 7 font more readable. There is a very useful guide to making these adjustments in the iPhone J.D. blog pubished by Jeff Richardson. You can find the complete guide here. Included are before and after screen shots so you can see what you will be getting before you make the changes on your own iPhone or iPad.