My bad if these have been posted before, but Knoxville did a really good interview on Hot Ones, ostensibly to boost his new movie at the time (which we also enjoyed, along with Grand Theft Parsons).
And he touched on those subjects quite a bit.
For me at least, in that interview his age shows the most; but also hear hard-won wisdoms that only a few of the Jackass crew have managed (and have yet to) learn.... notably Steve-O, being the most surprising survivor of all, who also did a Hot Ones interview.