Will a guy outgrow his drinking after college?

Outgrow alcohol abus. If he drinks as a result of peer pressure, and does not have internal impulse to drink, and does not drinks or binge excessively [i.E way less than 5beers or equivalent/day], and his elder generations are not alcoholics or/and no mental diagnosis, then he may have a chance to outgrow his stupidity. Alcoholism is strongly hereditary. People cannot get addicted to it unless the genes to digest exist.
Maybe. Unfortunately many people have longstanding issues with alcohol overuse and misuse - age is not the cause.