Why are the apps on my iPhone keep on crashing?

When I press on the downloaded apps on my iPhone 3G the phone automatically returns me to the home screen I tried switching my phone off and on but still the apps keeping on crashing. I've tried checking for updates in the app store but all the apps are in date.

Added (1). Also these apps have already been on my phone for a year and they have also worked since I've downloaded them.

The iphone 3g doesn't support many apps, that could be the reason.

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