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.
I believe that most states require you to retake an ID photo every so often, same goes for passports. You could age relatively normally and still retain ID as long as you renew when it expires and update photos as required.
And it’s not entirely out of the question that even with the same real birthdate, such a legitimate ID of an immortal could be overlooked.