I had my website running on PHP 5.6 for almost 2 years. My hoster has been offering PHP 7 for a while now, but didnt have time to move to 7 yet.
After having read a good article about the advantages of PHP 7, put in some time to move from PHP 5.6 to 7.2.
Eventually I will have to make the move anyway, my hoster will eventially stop supporting PHP 5.6.
In addition PHP 7 should be a lot quicker then, so still a good reason to switch.
It costs a lot of time to go over all pages to check if they are still working.