My son is 3 years old and 5 months--he just potty trained last week. I tried stickers, candies, etc., for a long time, but nothing worked. My older son trained easily and was trained at 3 years, 2 months.
Now, my younger boy is a pistol. If you read my previous posts, you will understand. Well, in the last two weeks, literally, he has done a complete 180 with maturity. He listens, doesn't whine, and is potty-trained. I thought it would never happen, but it finally did.
A long time ago on this site, a mom mentioned that the "magic" age for boys is 3-1/2 for potty training. Her advice has always stuck in my head and from what I have read, seen, and heard, in most cases, 3-1/2 is about the right age.
I know it's tough, but hang in there. His time will come.