Grandpa signs up 19 years ago. Grandson has, at some undetermined point later, gained access to Grandpa's account.
How old is the Grandson?
How old is the Grandson?
How is being their own grandpa makes them younger than 18 if their account is 19 year old ?
Or anyone is time travelling and your explanation is basically just magic.
Definitely Alabama vibe though :].
A predestination rewatch has been on my mind for some weeks now, I know how I'll spend the evening :].