When did you stop wiping your kids?

So I have no idea what the age is that you stop wiping your kids after they go to the bathroom. My son is 3 so I know I had a few years left, but I figured maybe by like 5, 6? I have no clue honestly, I’m just throwing ages out there. I just found out my sil still wipes their kids and they are 11 yr old twins. I had no idea you had to wipe them that long. When do you stop? 12? 13? I know obviously however long they need help, you help them, but wondering at what age did your kids no longer need help?