Orochimaru knows everything Kabuto knows.
We all know that Kabuto knew how to restore the Edo Tensei zombie to their youth state, example: Madara.
From the two points above, Orochimaru logically should know how to restore Hiruzen to his youth.
So because Orochimaru logically should know how to do it, I don't see why he shouldn't do it.
In conclusion, prime Hiruzen is coming. Watch cho' back Madara.
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We all know that Kabuto knew how to restore the Edo Tensei zombie to their youth state, example: Madara.
You must be registered for see images
From the two points above, Orochimaru logically should know how to restore Hiruzen to his youth.
So because Orochimaru logically should know how to do it, I don't see why he shouldn't do it.
In conclusion, prime Hiruzen is coming. Watch cho' back Madara.