Google play services doesn't get installed I just wanted to upload a video on YouTube but after updating the app to the latest version , it says that it needs Google Play Services to run. I tapped different places of the screen because it sometimes works with other apps, but this case is not the same. I tried hitting the back button and it just quit. I installed that Google app several times but it doesn't get installed. What should I do?
You can download it from here, 
you need to search for your android version.
http://www.apkmirror.com/apk/google-inc/google-play-services/
you need to download for your android version>4.1/4.4/5.1/6.0
or try to reinstall YouTube

I have the same problem. 

I just download play services and problem was fixed. 

EDIT:they support android 2.3+ im using old android phone now,and I can confirm that they support ,also confirm that it's  working for 4.0.