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.
Isn’t that just a different way of answering the question though? Do you think 60 years is the answer but don’t want to say that?
60 years is within the reasonable lifespan of a human whereas 150 is not.