Iphone 4 keeps being glitchy?

Sometimes it will just shut off randomly and i have to reboot it. Don't tell me its cuz of the battery its not. It just happened and it was at 50%. The battery also dies within 15 hours (which i believe to be normal) apps also crash sometimes and my instagram and camera apps are extremely glitchy. I've tried deleting photos and so forth but nothing works! Please tell me what's happening?

Try to restart your phone by holding the lock and home buttons like a screen shot until the screen goes black. If that does not work then your phone is just getting old.

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