so why does anybody do it young if they are following jesus example.
That's just it; they don't really follow Jesus' example. As a matter of fact, if you look at their teachings closely, they take Jesus out of the picture as much as they can. See Blondie's weekly threads on "Comments you will not hear at _____ Watchtower Study" for specific examples.
They have no right to call themselves Christians, especially true Christians, when they don't follow Christ or even acknowledge him.