Why on earth did you bump a thread that has been dead for 4 years and has a broken poll? There still isn't a group for 30-40 year olds and it's not clear whether the age groups are inclusive or exclusive of the end-point ages.
the way this poll was constructed is one of a myriad of examples of the failure of the american educational system. the fact that people are clueless how to rectify the missing category also shows a lacking in problem solving ability. maybe instead of ethnography the OP should take or likely retake a course in basic statistics
Seriously, all you have to do is ask a moderator to modify the poll. I was only interested in the age 20-30 range result, otherwise I would've asked.