I just realized something ....
We all know, or should be knowing at least, that longevity comparisons can't exactly be made on a 1-for-1 basis, and that some kind of adjustments have to be made in order to account for a ton of factors. In other words, while Mikita arguably has some kind of advantage of Howie Morenz in terms of "raw seasons" when it comes to longevity, it's good practice to give Howie Morenz some kind of mulligan, due to playing in an earlier era. Or else, we aren't comparing apples to apples.
But would it be fair to say that D-Men have an intrinsical advantage when it comes to longevity?
In other words, Niklas Lidstrom has an advantage over Jaromir Jagr when it comes to longevity as an elite player, but how much of that is directly related to the fact he is a D-Men? If the answer to this question is other than "None", should we even bother, considering forwards and goalies have built-in advantages of their own?