When should your child wipe his own bottom?

Alexis
Hello mommy's ! I was wondering at what age did you teach your child to wipe his/her own bottom? My stepson just turned 4 and his dad & I decided it's time to start teaching him to wipe himself. He is a very independent child and always wants to learn new things and not be treated like a baby so we feel like it's time. We've thought about the flushable wipes to make it easier for him as he tends to have "sticky poop". Please let me know what age you taught your child and advice on what worked best for you. Thank you!