I agree with dragoncar. Someone with a net worth of $40 should not be in the same category as someone with a net worth of $225,000.
Yup and perhaps a 20 year old shouldn't be in the same category as a 50 year old? Single question polls are tough to make robust, though.
Alternative (with options listed):
-20's or younger, negative to $0 net worth
-30's, negative to $0 net worth
-40's, negative to $0 net worth
-50's, negative to $0 net worth
-60's or older, negative to $0 net worth
and then repeat for each successive net worth level. Obviously, the more concise you make the groups the less you can derive from the poll but you don't want anything too hairy either.