JARVIS is programmed to listen to me, regardless of how old I am. I can lock myself out, but then younger me just has to give an order and I'd be back in.
Yeah, but younger me can override it. See, when I first built JARVIS I didn't think about time-travel so one of the basic building blocks, so to speak, is to do as I ask. There are fail-safes, but those are triggered depending on the order, not on how old I am when giving it.
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