And while I perfectly expect joke answers, this is also a serious question.
when they can stand it
Funny and factually correct.
About the time they start walking.
Once they’re standing up, they’re tall.
While they’re still laying down, they’re long.deleted by creator
And at what age do boys start to measure length again?
Usually around 12-15
??? not a joke answer - what is the difference between length and height?
90°
Orientation.
I guess that answers it then - when humans start walking instead of crawling
they are the same thing, this is just a matter of when they are able to stand up to measure them while standing vs while lying, I think
around 2 years old I guess, when most people are able to walk frequently
This would make sense
It depends… length of what part?
(No, don’t try to tell me that wasn’t what you wanted to hear! :-))