I think it existed after, I mean humans created time to keep track of the day
physics wise time will only flow forward
I hope so and as I type this scientist are trying to find ways to time travel in a recent project. if u go a million light years out in an hour(not possible tho) at the age 35 and then go back to earth, you will be 35 and ur friends that were 35 would be 75 so that's kinda like it.
