What is the right age to toilet train your baby? 12 months, 18 months, 24 months? Later?

My eldest kid started late, about 4 y/o. His younger siblings learned earlier and faster since they watched the elder ones doing it. It is easier when siblings help to encourage the younger one doing potty training. My 3rd kid already potty trained before she reached 2, because she was excited to be on the toilet like her big sister. So just like what Yuna said, each kid is different and when they are ready, they'll learn it.