Stipulations:
- You cannot die and are immune to disease
- You cannot alter the future such that you change the world from your point of origin. i.e. You cannot become so famous that future people recognize you as immortal.
- If you vary the timeline too much you will cease to exist.


I stay in my same body, at the same age I am now, keep all my teeth, etc? I am nearsighted, it’s gonna be difficult.
What happens when I pass the day I am born, though? Are there 2 of me?
I don’t think I’d change the timeline much anyway, it seems hard to. Though I’d love to become a lawyer and advise Al Gore against conceding the election he won. Even if I ceased to exist that might be worth it.
Im assuiming doctor who rules where just dont interact with yourself
I’d assume Harry Potter time turner rules, where there were always two of you when you were growing up, because future you had already gained immortality and gone back in time. But you never realized there was a second you when you were growing up, because future-you actively avoided interacting with past-you.
It also resolves a lot of the “what if you accidentally change the timeline and prevent yourself from ever being born” types of paradoxes, because you were already born which means anything your future-self does will automatically resolve with you being born.
tomato tomato