The training for a young kid is tricky. I felt my son was too young, but my husband wanted to stay there (I'm talking about
Disneyland). I made up a little sign for my son and he waited patiently for almost 40 minutes, which I was very impressed with!
I was concerned b/c even though we had told him over and over that he might be picked, I had a feeling he would be upset if he wasn't. And *to me* if he is still young enough that he would cry if not picked, then he's still too young for the training...I had a strong feeling that he would NOT appreciate not being picked, and I really felt he was too young for it.
As it was, we had another sort of "life isn't fair" thing happen. After waiting so long, after having the CMs look at him quite a bit, especially once I gave him the little sign I made up...when they had them stand up and cheer, he realized he had to go to the bathroom. Not 5 minutes before they were going to start! And even though the bathrooms are close, we couldn't have gotten out, done, and back to "our" spot in 5 minutes.
So we had to take him out (at a brand new 4, when a kid has been out of dipes since he was about 2, you do NOT mess around with possible wet pants) and we were ALL in or near tears at how sad it was*.
*compounding the sadness was that only 1.5 hours earlier either my husband or I had lost DS's too-big-for-him "build your own" lightsaber, and it was GONE, someone walked away with it and never turned it in to lost and found...so it was just a bummer of a morning.