I am able to drink some beer, but not much. I can hold my liquor very well. Takes a lot to get me drunk. I just cant swallow down so much beer though.
I have a friend that he was able to drink drinks that were 100proof, that is 50% alcohol content, right when he started to drink at age 19.
Some times it matters on your genetics as well.
Me, it is even had for me to drink something that is just 10proof. I can drink it, but eventually I start to find it harder to swallow.