10 years old. I never got potty trained and my best friend was jealous of me, he wanted to be like me and was jealous that I still got to wear diapers and he didn't.
I could never be potty trained, but I remember my parents sitting me down on my potty, but I wouldn't go or they would take my diaper off and I would do pee pee the minute the diaper came off.
Use plenty of baby powder and plastic backed disposables won't chafe your legs. I wear disposable plastic backed diapers 24/7 for as long as I was alive and never had an issue, even playing ice hockey and inline skating.