Well, there is no post game content in Link to the past if I recall. If there's no post game, then after beating the final boss, you will simply regain control right before you went in.
Bulbagarden
Greninjaman
Daren
Yeah, but I was curious if Ganon wold come back or if he'd stay dead and I could just walk up into the final room and win.
Poke Dragon
That's pretty much the case with every Zelda game, the final boss is always available to be fought, even in the Minish Cap where there is a postgame.