Than he said, if you have a kid of 14, 15 or 16 years and the kid is not baptized yet, wat about your education?
At that age they should be baptized or thinking about it.
I think this is a fairly common unwritten rule, but it's unusual to hear it spelled out explicitly.
Imagine you have an 18 year old son not baptized.
And that's exactly what worries them. If the kid makes it to 18 without getting sucked in, they're a lot more likely to start making a life for themselves that's not centered around the org. The WT needs to get them while they're still young enough that their environment is controlled (and also young enough to be more easily guilted or pressured).