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On average, a girl is ready to be potty trained at approximately 29 months of age, says the University of Michigan Health System, compared to 31 months for the average boy.
Potty Training Start to Finish. Boys and girls are both developmentally ready to start potty training sometime between 18 and 30 months of age. The average age for boys to complete their training is 31 months old, according to the University of Michigan Health System. About 98 percent of kids are completely potty trained by 36 months of age, and the entire process typically takes three to six months.