I have spontaneously thought of this in the recent past of a whole 4 minutes.
So if one who is 10ish years old goes to the future and meets himself at about 40ish, then would the one at age 40 be able to remember the future up to a point that the past self was in the future?
If the 10 year old is in the future, then that means the 40 year old would have had to travel to the future when he was 10 and then back again. Therefore, once the 10 arrives (let us say he was there for two weeks), the 40 would be able to remember things 2 weeks into the future.
How how he traveled to the future i cannot say, but neither does the grandfather paradox.
Please disregard the current impossibility time travel....