The divorce rate for JWS in the age group 25 and under is just as high as the general population.
In my area, that age probably extends to the age group under 45 now. It seemed to really start picking up steam in the late 90s with the rapid adoption of the interwebs and only accelerated with the adoption of texting and mobile email.
It's something of a joke now. A good sized group of us recently were trying to think of anyone recently who was actually a virgin when they got married. More than half were already on their second JW marriage anyway, and those on their first marriage almost all had "sown their wild oats" plenty before their first marriage.