I started drinking coffee at the tender age of 15...
and I still drink it regulary at the age of 18.
I happen to like it's taste (no sugar or cream, just black). And I have found it does wonders for my academic performance.
I drink about a cup in the morning. On days that I need the extra boost I drink an extra cup few hours after.
And I also have found that it does good things for my athletic performance. It dehydrates, but it can be compensated for.
Pros don't hold back on caffeine either.