At your age, kiddo, any is too much. But how about for someone of legal drinking age? You may not have a BAC of 0.08% or higher if over 21, 0.01% or higher at any age if you are on DUI probation, 0.04% or higher if in a commercial vehicle, and 3.90% or higher if you are part man, part wine cooler. Or plan on being dead by the end of the night.