I was completely potty-trained when I was around 2 years and 8 or 9 months old (very standard age in some countries in Asia).
Funny that my first full speech was considerably late at the age of 4.
For some reason, I have some health problems since I was a kid to today. So, this also triggered my semi-reliance with diapers. Hell, I was wearing diapers half of the times for 6 months last year.
