Apple apps and iOS problems?

Hi, I'm using the iPhone 4 & iPad 2, both using iOS 5. They both have the YouTube app (the old one) and I accidently update my iPhone 4 to iOS 6.1.3 and the YouTube app is no longer available so I plan on not updating my iPad 2 because of that YouTube app. I do not like the new one because its realt complicated and the old one doesn't have any advertisements popping out. In both my iPad and iPhone, I also have the older ver. Of twitter and I do not want to update it. I'm wondering, in the future, will I still get to use the old twitter on my iPhone if I keep updating to a newer iOS (if there's one) but not updating twitter?

Also, if I do not update my iOS 5 on my iPad, the same as my iPhone 4, will twitter force me to update to a newer ver. Of twitter & iOS to continue using?

It is your choice whether or not you wanna update to a newer version of either ios or twitter, but next time there's a new update, go check the information out, so you can see what the features of the updates are. I know that i did that, so i'm still on ios 5.1.1 so i still have the old youtube ad.
but if you really wanna go back down to a older version - google in 'how to downgrade ios' its complicated but it works

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