Title is pretty much all.
Some context:
I took an edible and had a thought last night.
What if I tattooed a ruler on my finger?
I never would actually do this, but my interest still piqued. Do hands keep growing? Do they stop growing? Do they shrink? How long would a finger ruler be viable until it needs decommissioned?
Stop growing longer? Yes. And when you get much older your whole body will shrink a bit. Plus they can always get fatter or skinnier! Nobody is gonna bug you about how accurate your tattoo is though. ;)