I'm sure there are plenty of people who get married and stay so without having lived together first. I am just speaking from my own experience and what my preference is/what I believe. I wouldn't want to get married without having lived together first.
And yes, I do agree that age and maturity also play a big role in the success of a marriage. Calendar age and emotional/mental age and the maturity that comes with it, for example.
Completely understand. My frustration is mostly with those that act like they are completely doomed to fail if they don't. I could careless about this either way. It's one of the things I consider individual choices that don't have a universal right or wrong answers.