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.
“Oh, you must be thinking of my grandfather, we have the same birthday”
And the same social security number. It’s a weird genetic thing ;-)