K.S.
I didn't read any other responses, but here's my experience. My daughter also started showing interest around that same age. I could watch her cues & didn't change a poopy diaper after about 18 months. Peeing did take a little longer. I assume that might have more to do with the fact that I don't really see any kind of cues that she had to go. I did keep her in a diaper until I could switch her to panties, I just didn't change any dirty ones. I just kept taking her & encouraging her to go pee. Eventually she just did. She was probably completely dry during the day by 2 years & at night by 2 1/2. Lots of time & patience.