actually there is a reason for the ears being tipped. The ears are supposed to be tipped 1/3 down. The reason for this was when they were out herding it would keep the elements out of the inside of the ear.
There is always a reason for everything in the standard it just may not be clearly described.
but anyways to answer your other question 6 months is most likely too late to tip them and have good results.
There is always a reason for everything in the standard it just may not be clearly described.

but anyways to answer your other question 6 months is most likely too late to tip them and have good results.

But if you are not going to show is is a matter of taste if the ears are going prick. Also starting at 6 months most likely wouldn't work anyway the cartilage is almost set by that time.