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From the movie we know that Momoshiki is eternally youth and immortal as long as he is eating chakra pills that he got from Gyuuki and Kurama, Naruto's KCM creates powerful life force that turns whith zetsu army into trees, Naruto was using that life force for healing but a Rinnegan user can use Preta Path to do this:
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The fact that Edo Tensei couldn't heal him means that he was actually an old man, another proof is that Karin was gonna become old from healing Tsunade because she is old.
I know you are going to say that Naruto is not gonna become old because of Kurama but look at this:
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Obito became Juubi's Jinjuriki but he didn't get his hair back to black, the reason is that Kishimoto made JJ Obito and Madara not be able to use Preta.
Another proof that only Rinnegan can do do it is this:
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This is the reason why Naruto wasn't able to save him unlike Guy who lived a long life, Guy had a physical damage but Obito had a life force damage that only the Rinnegan controls.
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This is one of the enormous ways that Sasuke have to become immortal.