Stone you dont have to be 40 if you dont want to, you can be 39 forever (and I dont mean by dying lol) i plan to stop recognising the passage of time on the day before my 40tieth birthday, after all its an artifical human construct etc etc.
I think i can use quantuum to prove i am 21 if i want to but 21 was rubbish, Ill stick with 37.