How to install apps on my Iphone 4?

I recently got an Iphone 4 because my old phone broke and it was cheap. I tried downloading apps but it just won't work. My friend told me that when Iphones get older they can't install apps anymore. But I'm hoping that this isn't the case. Every time that I try it downloads the app but won't install it. Instead an error message pops up saying "Unable to Download App" and that the application could not be installed at this time and it asks me to try again. But no matter how many times that I try again it never works. Any suggestions?

That's an odd problem.

What I do when I get this problem is to restart the phone. Turn it off for about a minute and try again.

If that doesn't work, sign out of your Apple ID and sign back in. Hopefully that will work.

Look at what version of iOS you have and whatever version requirements are for that app.

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