Hi, I am in college and intending to go to grad school after I finish my undergrad degree. However, I've been wondering if it would be feasible to take a ~4 year break in between for personal reasons. I recognize that some sort of review would be needed before I resume my education, but to what extent? Also, I've heard that matriculation into grad school can be deferred for a certain amount of time, but I don't know for how long. Would it be advisable to apply to grad schools before this hiatus, or would it be better to wait to apply until I'm ready to come back? Thanks.