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 figure that you are wealthy by this point and your lawyer has all your records. They’d be able to establish and maintain your identity in some way. But yeah, just live your life however you like at that point.