I mean is it like, henry goes back 10 years in age but his surroundings and people around does not go back in time ? And for example, if the above theory is correct, does henry forget things ? i mean if he is 50 and he goes back to 40, will he still remember what he learned from 40-50 ? TYVM for your time but please do not include spoilers to illustrate your point as i am only at the beginning of the book.