Does drinking in adolescence harm brain development? Does consuming alcohol before age 21 cause permanent brain damage? Does underage drinking retard mental development? “Research indicates that the human brain continues to develop into a person’s early twenties and that exposure of the developing brain to alcohol may have long-lasting effects on intellectual capabilities." I am 19 years old and from 24th of December/13 up to 4th of January/14, I have drunk 10 glasses of wine in roughly 8 days. My father suggests that the brain continues to develop until age 21, and that young brains can be irreversibly damaged by alcohol. I tried to explain to him that drinking 10 glasses of wine in 8 days only, cannot cause damage to a young man's brain, but he doesn't believe me. Am I wrong?