I'd like to make a suggestion to anyone out there this may apply to...
Our DD

is now three years old and looks every bit of three to us. We bit the bullet at three years and four months to get her an AP. We wish we hadn't. Although we know we will have her back soon (May), we were there in November and again in January and both times we practically had to beg the turnstille worker to make her use her pass. They were just ready to assume she was under three. Again, she looks every bit of three. The reason we were so upset is that we paid for something that we thought would be scrutinized more closely. If we had her in her stroller we could have gone in and out over and over and never questioned. Then we could have waited until this coming May to finally get hers. Even if we stopped a couple of times we could have bought a door admission.
Moral of the story, don't rush out to but an AP as their third birthday gift. Especially if you are visiting around that date. This is merely my opinion.