J.L.
Hi V.,
from what I hear, and my own experience, boys are harder to train than girls. My daughter announced when she was two "no more diaper mommy. I big girl today."
My son...well it was around 3+ years. I had to leave him bottomless and he would run around that way. he would have no interest in using the potty if his diaper was on! I tried the M&M method also...he thought that was fun! Good luck.