i do not remember my birth, but i do remember my early childhood vividly.
Generally people don't remember their birth. Usually, vivid memories start around the age of 4-5, well, at least for me they did.
I think it's much more realistic that it turned out that way.
I find that trips like that are amazing, but have the potential to be very scary because living another life for so long like that would have extreme repercussions like you described - like forgetting about the life you "left behind" .
I think if one's mind was mentally conditioned to handle such an adventure could potentially come out of it rather inspired. But I imagine that sort of mastery would take much longer than 18 years or 31 years. Which makes me think I should try that method of steady progression, rather than trying to take as much as I can.
Sure it would be the most vivid thing you'll ever experience, but your mind just wouldn't be ready to take on that commitment. I guess you could say it would be like a child trying to beat an Olympic sprinting record without even knowing how to walk yet.