If I was a secret immortal how long could I keep the same US ID for before I get taken away for study. I'm thinking 150 years.
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.
When your id says you're 100 and you look 21 it's going to cause issues.
You want to get away from ever needing an ID. The wealth you gain from compounding interest should allow you to hire accounting experts who will handle your transactions and hide your wealth among shell companies. I think once or twice you could go with the "this is my child, me Jr" routine, but eventually you need to have some kind of emissary who conducts business on your behalf while you cycle through fraudulent ids and move around every 20-30 years.
When your id says you're 100 and you look 21 it's going to cause issues.
You can use this to your advantage, by claiming it's some sort of annoying mixup and it happened before. You can use this to sneak new info into the system when they need your help correcting the obvious mistake that you're not 100 and get your dates reset.
So awhile ago I worked on a system that moved education records between 2 different systems at a university. It kept choking on one particular record; turns out the date of birth was in 1499, and MSSQL won't store dates from before the start of the Gregorian calendar unless you specifically configure it to do so.
We sent a request through to have the record corrected - clearly someone has just typoed 1949 - and moved on, but maybe.....
It's not about close position in this case, it's that the idiot was typing quickly and hit the numbers in the wrong order. Also, a numpad was more likely used than the number row.
All I can think of is a gruff, blue collar worker coming home, covered in oil stains. He hangs up his hardhat and lunch pail at the door. "You would not believe the day I had!" He says, "Some jackass put the 9 dies in the 6 press, and I had to spend all morning trying to pry open the hydraulics without fucking them up. After all that, I get a call that the serifs are too long on the ones and they're getting sorted as sevens!"
It'd be cruel to the people around me, but I do rather like the idea of starting over every 30 years or so, your could try out so many different paths.
I've had that happen a few times recently (wrong comment replied to) and I have no idea how it happens. For the upvotes... well it's either there's too many Lemdiots on this platform, or bots (oh noes!).
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.