It’s not like there are people checking for immortals, I think it would be flagged by a dmv employee or something when they dont believe a clear 21 year old is actually 150. Let’s assume it’s current day im caught and not bring speculation on what the US is like in the year 2139 is like.
what happens when the child is immortal too?
Child didn’t have to survive birth. I think that is what happens in highlander, he finds dead children’s names and takes them.
It’s like a ponzi scheme. You take their identity and now they have to start the process themselves