"So many people are shut up tight inside themselves like boxes, yet they would open up, unfolding quite wonderfully, if only you were interested in them." ~Sylvia PlathIf you have the time, "Tell me about yourself" is one of the best opening lines.
If you ask a young person that question, they'll tell you about art and philosophy and music and hobbies.
Old people usually just tell you their occupation. They've been stuck in their boxes a little longer, so you have to pry a little harder to let them out.