Honestly, you'd be surprised. I don't know where I can look this up for around the league, but the vast majority at least have a cup of coffee by 22. For example, on the Wings last year, only Holl made it later and Walman at 23 (he played 1 game at 22 which I won't count). Walman only had 25 games at 23, so he is the example of a guy that even at this point, found a way to turn it around. But Walman is pretty well known for making bone-headed mistakes all these years later and the Blues clearly didn't think he was ever going to amount to anything. He's a 'found gold, late bloomer' exception. Holl clearly sucks.
For the quick search I did of better teams, it's essentially only their bad bottom pairing fighting types that make it this late for the first time. Florida, for example, has 11 defenseman listed on their roster and only 2 irrelevant guys that I don't recognize made it at 23 or later. I didn't find any top 4 D outside of Walman that started this late on the 4 teams that I checked. I'm sure there are a few counter examples, but unless there's a website that would let me search for this, I'm not spending the time on an exhaustive search.
There is a selection effect there though that skews the number. Better players make it earlier because they're better and teams want to utilize them. They end up being good and sticking around not only because they had a better development path, but also just because they're better to begin with. I don't think that selection effect is near enough to explain the data, but that's debatable.
It's also not that 23 is some magical cutoff. AlJo could still be fine, but I think if he can't play a lot of NHL hockey this year, the path only gets tougher. We're also working in Edvinsson as a rookie at the same time with more prospects close behind. He doesn't have much runway and opportunity to use what runway he does have.