I began my drinking college career before the universal 21-year-old drinking age, it was 20 in Massachusetts, and it did not interfere with my drinking at all, so I approve of the efforts by over 100 college presidents to lower the drinking age to 18 (the Amethyst Initiative).
They believe that the current regime leads to unsafe habits and binge drinking, and I agree.
My observation, and I was at college through the transition, is that the change in the law did not make for safer drinking, or a reduction in drinking and driving.