He meant "eternally young" because he can still get negged.
Kishimoto said he needed to switch bodies to stay alive.
He also said he'll outlive everyone.
Yeah as long as he switches bodies.
are you trying to make a point?
Get your shit together people.
Orochimaru is not immortal. If you don't give him a body he will die just like the rest of the world. He can also get caught in Infinite Tsuky which renders him dead after the tree transforms him in to WZetsu. If Kaguya destroys the world Orochimaru has no chance of surviving in Space.
Also, Kakuzu he is not immortal also. If he would get new hearts he will live forever as long as there are humans on the planet.
The only immortal in Naruto verse is Hidan who got blown up to pieces and still lives underneath the ground he even survives in space.
Orochimaru doesn't need to steal anyone body, Orochimaru body is a zetsu so Orochimaru can just create a Zetsu Clone.
Lets not forget that Orochimaru body transfers allowed him to gain all access to the other person KKG, abilities and powers.
Edit
Lets not forget that Orochimaru can experiment on as many Zetsu as he likes since Orochimaru can create as much as he likes.
Kishimoto said otherwise. Its not about the body being in good physical shape, Oro transfers his soul which later gets rejected by said body.
By who? Naruto and Sasuke? He'll outlive them.
Bolt? Salad? Lmao.
When you live for eternity your knowledge and power increases indefinitely.