Who knows. But my guess would be when your a child in loz, oot, he's probably around 30-40 years old and when your either a teenager or an adult, he's around 37-47. im not sure on how old he is, but this would be a pretty good guess.
You never kill Zelda.
Project64
Ganondorf
To get the water tunic you have to find or buy it.
they are found in the spirit temple
You get them in the middle of the Shadow Temple as Adult Link.
It depends. If you are talking about Orcarina of time then it is the shadow temple
You can't. Zelda is the princess you save. If you COULD kill her, well, there would be no point of the game at all.
If its the whale you have to catch i fish in a empty bottle and feed it to him.
The sidequest for Biggoron's Sword is completely optional. It can be a useful weapon, but it is not mandatory.
By dropping bombs straight into its eyes, they will turn red when you do it right.
If you're asking for a good walkthrough, I'd recommend Zelda Dungeon. If you're asking for a walkthrough as an answer its not humanly possible.