They teach that marriage is the 2nd biggest decision of a Christians life, the 1st being baptism.
They also unofficially taught that a person is not developed enough, whether it's their decision making portion of their brain, their likes and dislikes until your mid 20's (Read the Young People Ask book marriage and dating). Try dating in JW land at 18 or before your 20's and 99% of the time you will get talked to about your age and the importance this decision will have on your life. Some elders will go as far as stating that you should wait until "you're older and more mature to date".
Despite that, they also teach that the 1st biggest decision of your life should be done when you are young. It's now getting even lower by touching on things like driver's license and giving examples of very young baptisms.
Do you see the double speak and hypocrisy? You're not responsible or mature enough to make the 2nd biggest decision in your life but you are ready to make the "the biggest" one.
I'm not downplaying either. Both getting baptized and getting married are two huge decision that someone should heavily evaluate. Both can be devastating and life altering if it doesn't work out. Would you marry someone just because mommy or daddy thought you should or others pressured you to do so? I'd hope not...
Could you imagine Jesus (if you believe in him) telling all those little kids around him and on his lap that they should get baptized if they feel they can ride a horse or go out and work? It's nutty and whether you believe in the bible or not, it's far from what the bible suggest and the few examples given. And since they claim to represent the god of the bible, you'd think they'd try to follow it. I've always said though, the bible can be used to push any agenda or idea, there's always a scripture that applies and can justified to fit your point or agenda.
That double speak shows me that they are all about the numbers to them. They don't care if is young Joe publisher is mature enough to get baptized or how old Susie is. All it is to them is growth on their chart that allows them to keep using the "huge growth" as a reason to need money along with buy and build a real estate portfolio. Not to mention it's 100x harder for young baptized Joe to leave when he's mature enough to realize it's not for him and actually have a decrease on the numbers than spiritually weak Alex who never decided to get baptized.