I would say average age to be finished is before 4, so three. You can start whenever you like, but starting is sure as shit not finishing. My daughter was 2 and just slipped the switch. My son was more of a gradual change. Kids let you know what they’re ready for, and I’m not one to force things. I watch parents and kids pull their hair out forcing things because of X, Y, and Z, but I don’t see the point in stressing everyone out. And it all got done, everyone’s happy. I will stress them out in a few years, when they’re older.
I would say average age to be finished is before 4, so three. You can start whenever you like, but starting is sure as shit not finishing. My daughter was 2 and just slipped the switch. My son was more of a gradual change. Kids let you know what they’re ready for, and I’m not one to force things. I watch parents and kids pull their hair out forcing things because of X, Y, and Z, but I don’t see the point in stressing everyone out. And it all got done, everyone’s happy. I will stress them out in a few years, when they’re older.