As
@MIDNJAC said, it's more about attitude and learning to be a student again. The reason is because,
on average, the combination of older and prior enlisted studs would struggle more than the younger ones. But it's an average, so there are obviously many who don't struggle. The reasons were mentioned earlier, and having kids really adds to the complexity of being a student.
Can it be done and you get jets? Absolutely, but it's going to take a lot more work and time management (and expectation management from the spouse) to make it happen.
I don't know what the AF lingo is, but for the Navy, it's "selecting" fighters (really, jets), not "tracking." Tracking sounds like you're taking pictures of tail numbers and then posting about it on the internets.