I'm all in favour for prosecuting surviving concentration camp guards too... be it for the sake of making a point.
And the point is: If you participate in a genocide - be it as a 19-year-old - you will never be able to get away from this. You can only hope to postpone the inevitable.
It may be something of a ordeal to be put through this legal process now as a 90-year old man. But then again, he did have the opportunity to turn himself in back in 1945. If you refuse to choose for yourself the moment where you face justice, this decision is eventually made for you by others.
Eh... actually, if anything, this is probably a better motivator for not turning yourself in. Based on the article, this guy didn't seem to have that hard of a life aside from a few immigration problems. The fact that he's getting ready to pay his dues now kind of, well, sucks.
That aside, though, given that this is apparently consistent with the law, I have absolutely no problem trying him. (That isn't to say I'd be staunchly opposed if it weren't, but consistency is kind of important when it comes to these things.)
Well, of course, criminals always try get away.
I meant it more as a justification why I won't lose any sleep over the fact that he's prosecuted now as a 90-year old.