If Voldemort had survived his final duel with Harry Potter and decided to reform and live on in peace, would it be possible for him to live for eternity? Or rather, in universe, if Voldemort decided to quit after book 6, would he have been able to live for eternity? Would his body survive the vagaries of time, or would he be susceptible to a normal death due to some ailments perhaps or just old age?
I read a thing on reddit recently that said if Voldemort never attempted to become immortal he probably would have lived longer than he did, especially being a wizard.
Under the circumstances you describe he could possibly still live forever, but that would never be enough for old Tom.
And he'd be unlikely to convince any magical court of his innocence unless the whole jury was made up of death eaters. He'd be locked up in Azkaban for a virtual eternity of sentences if there was magic capable of binding him, and that would probably be worse than death.