Serious question - have you ever heard Wenger speak about retirement? He has spoken on the subject several times during the last five years ago, because he keeps getting that question, and every time Wenger talks about retirement he makes it sound like only slightly better than death.
Personally, I think he wants to stay at Arsenal as long as he has his health. And the bloke looks super healthy... Mentally, he doesn't look like a man, to me, who has lost any of his hunger and motivation either.