How Old to stop spanking Daughters?

[TheKeysGuy]

Being the new kid on the block here I'm kind of shy to answer but I feel if there is nothing sexual about it and the vaginal area is not touched a good still spanking will remind them that they need to behave. I also feel they should see each other get your hand or belt put to their bare bottom. That will show the other exactly what will happen if she does something spank worthy too.