Yeah pretty poor metrics. Don't take it personally, just there is a major difference between an 18 year old and a 25 year old, so getting a picture of the CoD age base, you really don't know if that 55% of 18-25s are high schoolers/just out of high school, versus college aged, versus just graduated college.
Huuuuuuge difference. Especially considering I'm making the assumption that you're making the assumption that the maturity level is somewhat correlated with age. Even so, you'd need multiple sets probably taking into account time of day (You won't see sub high school age much during the morning/early afternoon during weekdays).