Clicking update just opens the app?

Snapchat recently sent me a message saying that soon my version of the app will stop working, and that I need to update the app. However, when I go to the app store and to updates and click the update button, my phone just opens the app and nothing else happens. This happens with all of my apps.
     Could it be that I don't have ios 8?
     Or that my phone doesn't have enough storage (1.5 GB available)?
     Or is it that my phone is older (4S - 14 months old)?
I have a friend who has a 4s iPhone without ios 8 and who updated her apps just fine...so any ideas on what's causing the problem and how I can fix it?

Free up some space, a 4S is still a good phone and you can update it to 8.2 just fine.  If that doesn't work, delete the app. Hold it until it wiggles, click X, delete. Go back to app store and redownload it. Should work.  Need to back up that iphone, there are several different ways to back your pictures or videos.

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