Kids should generally start potty training between 18 months and 3 years of age. Most children complete potty training by around 3 years old, but readiness varies. Key signs of readiness include being able to communicate the need to go, staying dry for at least an hour, showing interest in using the potty, and being able to follow simple instructions. Starting potty training when the child is developmentally and emotionally ready, rather than at a fixed age, tends to be most effective. Some experts suggest beginning introduction to the potty as early as 18 months, with most children mastering it by ages 2 to 3. Girls typically potty train slightly earlier than boys. Consistency and patience during the process are important for success.