How can I delete all the old apps in IPhone 5s

The write-up by Apple Support may help: Delete apps on your iPhone, iPad, and iPod touch - Apple Support

You have two options -

1. Delete an app entirely, or
2. Remove the app if you think you might need it in future. Removing the app, keeps data on the iPhone.

If you've tried this and are still having issues, we'll likely need more details to help troubleshoot.

If you delete an app that you have previously downloaded and then need it again, you may not be able to re-download the app.

This because you're on an old version of iOS, and various third-party app vendors have discontinued support for iOS 12.