YouTube Apps

YouTube requires iOS 11 or higher, You need at least an iPhone 6S to run iOS 11, you can however, use the website

You can't. Youtube requires you have a phone capable of running iOS 11 or higher and your phone is now too old to do that.

If you want Youtube on your phone, you need a newer iPhone.

You'll need to buy a newer iPhone for that.

YouTube app runs only on iOS 11.0 or later.

You cannot install on iPhone 5c with iOS 10.3.3