The way things are now, I'm sure that a lot of Catholics who were born into Catholic families, fell in the mud of the sinful world as it is now, and had to eventually wake up and "convert" to the faith truly and in their hearts and way of life.
It's easy now to be born "Catholic" but have no concept whatsoever what it means to live it or love it because of the sewer of the world around us that poisons us constantly just by being in it. Many have probably lived lives they will regret, who felt like they were just meeting the Faith for the first time in their late teens or twenties or even later, when they had at some point an "aha" moment of realizing that they were complete hypocrites... going to Mass and maybe even saying the rosary, but having next to nothing of the love of God, truth and the Faith in their hearts... realizing that essentially they were complete strangers to God, to Mary and the saints, to their own Faith, and to what it means to live a genuinely Catholic life.
In the end, everyone, Catholic or not, has to "convert", and for ever more and more of us, I think it's feeling a lot more like we are real converts... like we came from a completely worldly life to something completely foreign to us, even if we'd had the ten commandments in our heads and went to Mass every Sunday. But absolutely everyone must, at some point, choose to really convert in their hearts or not. Whether this Faith is to them just something they do, and that means nothing to them, or whether they really want to see God face to face for eternity, and learn to love Him and live for Him in this life in such a way that it will be possible to reach that goal.
It's the hardest thing in the world for someone of a completely worldly (and sinful) life and mindset, to wake up and realize that eternity is a reality, and that every second, every thought, word and action, are in actuality choosing for them heaven or hell, and that if they want heaven and God, they will have to completely change the way of life they've known all of those years before, to one that will ask of them to give up everything sinful, everything of sinful pride and everything of their lusts of the flesh and of things, food, etc, that they've embraced, wallowed in and been addicted to for all those years as a way of life. But even many Catholics living less mortally sinful lives can reach a place of indifference and lukewarmness, where they think they're doing "enough" and don't care to go 100% and shoot for absolute perfection (sainthood, our universal calling or vocation). But all have to make the choice eventually. God knows whether or not we're taking Him, and our sainthood (not our "good-enough-hood" or our "nice-guy-hood", but our SAINTHOOD... our perfection) seriously. And taking it seriously... really seriously... requires a conversion, or waking up, where we realize that this is really the one and only thing that matters for us, and the one thing that's worth living and dying for, and where we make the choice that no matter how painful it may be to take it seriously, we have to choose, because in reality, we ARE choosing... that deciding to just go on without thinking about it, or living like it's impossible or doesn't matter, is really choosing not to try for it.
All have to convert... first to the Faith, but then to the path that leads them ALL THE WAY, to heaven and God: to aim and fight for their sainthood... their perfection... and nothing less.
I guess if you think of it that way, the better question might be, have we all really converted yet? Or are we still just living comfortably, lukewarmly, with the idea that sainthood, and seriously, really, truly TRYING for it... is something that just doesn't apply to us? That may be the most important conversion of all. After all, Catholics can go to hell, just like anyone else.
"Know you not that they that run in the race, all run indeed, but one receiveth the prize? So run that you may obtain. And every one that striveth for the mastery, refraineth himself from all things: and they indeed that they may receive a corruptible crown; but we an incorruptible one. I therefore so run, not as at an uncertainty: I so fight, not as one beating the air: But I chastise my body, and bring it into subjection: lest perhaps, when I have preached to others, I myself should become a castaway...
For I would not have you ignorant, brethren, that our fathers were all under the cloud, and all passed through the sea. And all in Moses were baptized, in the cloud, and in the sea: And did all eat the same spiritual food, And all drank the same spiritual drink; (and they drank of the spiritual rock that followed them, and the rock was Christ.) But with most of them God was not well pleased... "