פירוש על קידושין 58:14

In Eretz Yisrael they seem to have preferred learning Torah for some time and then getting married later (hard to know when). This allows the student/rabbi to learn full time without a “millstone” around his neck. [Let’s face it, marriage is a responsibility for both partners, and it is hard to be completely dedicated to a project while one is also responsible for a family]. In Babylonia, they marry and then head off to the Yeshiva to learn.