For the past few years the number of apps compatible with older iOS versions shrunk tremendously. However, when Apple released iOS 7, they added a long awaited feature to the app store. No longer do we who have been stuck with the original iPhone and iPhone 3G have to Jailbreak our phones and scour the internet for older versions of .ipa files. Using sketchy third party programs to install them.
Now, when we the unfortunate few go into the App Store to download an app, we are presented with this badge
Which then allows us to download a working, albeit slow version of the app.