Old couple turn back time and become young and strangely no one rlly minds it and apparently they see an hourglass in their dreams which is what changes their youth so if they turn it they turn back old but vice versa. Now the thing grandma accidentally turned it too many time i think and now she's like back to her young self completely with like black hair and can only rmbr her youth not the present.
But I'll keep reading it one day when I need some light fluffy(?) in my life