[TYPO3-install] Old T3 Installation 4.7.14 PHP

[Scott Bold]

Hi Guys

We've got a old typo 3 installation here on version 4.7.14. Our provider will turn off PHP 5.3 soon. 

As we're not planning to upgrade this installation, I was wondering what's the highest PHP version in which 4.7.14 is working? I didn't find out where to check that. Can anyone tell me?

Is it possible to upgrade this old installation to the current stable?

Thanks for you help!