how would a time traveler age?
is aging not the passage of time?
if someone was unnafected by that passage of time how could someone age?
and even if you did couldn't you right before you die just go back to yourself at the beginning of the time travel and tell yourself everything you learned? therefore making yourself immortal?
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Most Helpful Guy
I think you might be confusing this with a different thought experiment, the one where one brother travels with the speed of light and the other one stays back on earth.
I agree with @LeedsDude
If you travel through time, you're basically stuck in a bubble of time yourself. You will age with the exact same speed that you'd age had you not time travelled. You talk about frame of reference and knowing about yourself ageing but all these things actually don't matter. It doesn't matter whether you realize that you are ageing because you'll still be ageing. Time is relative but it is still objective in the sense that it applies to all people at all times at all places. Whether you're sitting here on earth or you're sitting on a planet on the other side of the universe (given this planet has the same mass and speed of earth) doesn't matter. Time will run with exactly the same speed. So, if you are stuck in the medieval times or in the 24th century doesn't matter. If it did, that would mean that medieval people aged differently than we do today and that obviously can't be the case.
As for the going back and telling yourself about it... this is a much more complex question. As you probably know, all the time travel movies teach you to not interfere with your own past because it can lead to unforseen and sometimes terrible outcomes. But let's still assume it for a moment. So, you're 20 years old and an old guy walks up to you. He tells you that he is you, just 40 years later. He tells you your whole life story and all the things that will happen to you. Now here arises the problem. If he is able to tell you all this, it would mean that the universe works in a deterministic way. It would mean that everything's already planned out. You can't change anything. As somebody who doesn't believe in a higher power, this seems impossible to me. But then, if you COULD change some of the things, for example your 60 year old "I" told you that you'll get into a car accident and you can prevent this car accident because you know about it - it never actually happened. But if it never happened, how can your future self know about it?
Now, to solve this you could propose the multiverse thesis. You could argue that both scenarios exist, your life with the car accident and your life without it, they're just happening in two different parallel universes. While this is theoretically possible, many paradoxical questions still arise.0
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