It's interesting to talk about Buffon because it seems, Buffon might be the only player who started his career and ended his career at the same club and that is Parma. Of course, as a legendary player there are many achievements that Buffon has and next, I will probably wait too. Will Buffon eventually become the head coach of a club in Serie A, or maybe Buffon will just pursue another business out there. But as a legendary player, I really hope that Buffon can become a head coach at a club in the future. Although it is possible, the chances are very low because it seems Buffon also is probably too old to start as a head coach.
In reality there have been other cases, I could name several and in any case it is not an isolated case, of course he could perhaps have played in Saudi Arabia or other places where they take old glories and pay them a lot (including Japan like Alex DelPiero). I dont know, in any case if he was happy he did well.