Yes, I age and my hair and nails grow at normal rates. Please keep in mind that gravity distortion does involve some dilation effects but “jumping” between worldlines are timelike trips, not spacelike trips. The air is about the same although I do smell and taste industrial odors here my parents cannot. The food in the future is grown and raised naturally inside the community structure. This is done primarily for safety reasons. I am amazed at the risks people here are willing to take with processed food. All of the food I eat here is grown and prepared by myself or my family. Unfortunately, I do not know if we are acquainted on my worldline. Yes, love is a challenge. What’s harder is knowing you could go back and correct a mistake but at the cost of the “you” on that worldline you want to live your life over again on.
The questions about the president and space travel are reasonable but now we come to a conflict between physics and ethics. First, the ethics:
I have seen a television program about a man who is able to speak with the dead. When I watch the show, I am more afraid about the possibility that what he is doing is real not weather or not he is doing it. Since I will be leaving this worldline in the coming year, I could easily tell you that the President lives or dies in the next four years. In fact, I could probably find some way to even charge you for it. When the day comes for my “prediction” to be realized it will either happen or not. If it does happen, then your ability to judge your environment is crippled by your acceptance of me as a “knower of all things” and gifted with the ability to tell the future. If I am wrong, then everything I have said that might possibly have made you think about your world in a different way is suddenly discredited. I do not want either. Although I do have personal reasons for being here and speaking with you, the most I could hope for is that you recognize the possibility of time travel as a reality. You are able to change your worldine for better or worse just as I am. Although this will make me a far less interesting time traveler, these are the rules I personally try to hold to:
1. I will not disclose any information that will cause someone to personally gain by its knowledge. This means no stock or sports tips.
2. I will not disclose any detailed information that would allow someone to avoid death by probability. This means no earthquake or bomb information.
3. I will not disclose any information that may compromise any future actions by individual people or threaten their family and well-being. I will not disclose names or events associated with individuals.
Now for the physics: The grandfather paradox is impossible. In fact, all paradox is impossible. The Everett-Wheeler-Graham or multiple world theory is correct. All possible quantum states, events, possibilities and outcomes are real, eventual and occurring. The chances of everything happening someplace at sometime in the superverse is 100%. (For all you scientists out there, if Schrodinger’s cat had a time machine, he might not be in the box at all.)
Therefore, there is a worldline where you are alive and another worldline where you have gone back in time to kill your relative and the you on the new worldline won’t be born but “you” the killer is still running around there. Differences between worldlines are measured from the perspective of the time traveler in terms of divergence percentage. The higher the divergence, the more “un-like” your destination worldline looks like compared to your worldline of origin.
Therefore, any “prediction” I might make has a slight chance of being incorrect anyway and you now have the ability to act on it based on what I’ve said. Can you stop the war before it gets here? Sure. Will you do it? Probably not.
As far as space travel goes… no, we are not on Mars yet but we’re trying very hard so we can avoid another “Hell’s Kitchen” outcome from an overpopulated Earth