Ali, legally they can't do that, but it's based on the premise that a man that young could change his mind kwim. I have heard of instances where men under 30 with no children have been refused it, but that's up to the individual Dr and if you really wanted it done, you would go to another one. I doubt that if you DH wanted one that they would knock him back because he is married and has completed his family. It would be the same if a woman in her 20's wanted a hysterectomy or a tubal ligation done, but at the end of the day it's her choice to do it.