Do you suppose Z had already done the deed, or was he about to?
Maybe he ended up like Steve Martin's character in Father of the Bride II.
As the comfortable family unit starts to unravel in his mind, a rapid progression into mid-life crisis is in his future. His journey to regain his youth acts as a catalyst for a kind of "rebirth" of his attitude on life when he and his wife, Nina, find how their lives are about to change as well. [IMDB]