I never wanted to get married young but I knew that if I waited till my mid to late 20's, there would be very very few brothers that were my age and still single--and those that would be, would want someone 18-19. This fact of JW life puts a colossal pressure on young women for a few reasons, the biggest being that your whole social status is tied to your husband being an MS or elder.
I've watched sisters who were married to elders, then widowed, go from being in the hub of social happenings to being on the sidelines. Older, unmarried sisters, for all the vaunting the WT does, occupy the lowest rung socially. Tragic, but true in the WT world.
Oh, I got married in my late 20's and am still married to the most wonderful guy in the world, who is patiently understanding of my fade, though active himself. I got lucky.